diff --git a/README.md b/README.md
index 898ef5f82ca49..8c99c2cb2d250 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,8 @@
 
 ## 介绍
 
+`题解代码里的 cyrus Tab 是我写的`
+
 本项目包含 LeetCode、《剑指 Offer（第 2 版）》、《剑指 Offer（专项突击版）》、《程序员面试金典（第 6 版）》等题目的相关题解。所有题解均由多种编程语言实现，包括但不限于：Java、Python、C++、Go、TypeScript、Rust，日常更新。欢迎 Star 🌟 关注[本项目](https://github.com/doocs/leetcode)，获取项目最新动态。
 
 [English Version](/README_EN.md)
diff --git "a/lcof/\351\235\242\350\257\225\351\242\23003. \346\225\260\347\273\204\344\270\255\351\207\215\345\244\215\347\232\204\346\225\260\345\255\227/README.md" "b/lcof/\351\235\242\350\257\225\351\242\23003. \346\225\260\347\273\204\344\270\255\351\207\215\345\244\215\347\232\204\346\225\260\345\255\227/README.md"
index 1c8f798a54345..e0807377c448b 100644
--- "a/lcof/\351\235\242\350\257\225\351\242\23003. \346\225\260\347\273\204\344\270\255\351\207\215\345\244\215\347\232\204\346\225\260\345\255\227/README.md"	
+++ "b/lcof/\351\235\242\350\257\225\351\242\23003. \346\225\260\347\273\204\344\270\255\351\207\215\345\244\215\347\232\204\346\225\260\345\255\227/README.md"	
@@ -42,6 +42,56 @@
 
 <!-- tabs:start -->
 
+### **cyrus**
+
+```kotlin
+/**
+ * 哈希表
+ * 执行用时：324 ms, 在所有 Kotlin 提交中击败了 51.19% 的用户
+ * 内存消耗：52.2 MB, 在所有 Kotlin 提交中击败了 64.28% 的用户
+ */
+class Solution {
+    fun findRepeatNumber(nums: IntArray): Int {
+        val map = mutableMapOf<Int, Int>()
+        nums.forEach {
+            if (map.putIfAbsent(it, it) != null)
+                return it
+        }
+        return -1
+    }
+}
+
+/**
+ * 原地交换
+ * 如果没有重复那么这就是索引呀，可以整理为 nums[index] == index
+ * 从左到右整理，如果不符合 nums[index] == index 则交换 nums[index] 和 nums[nums[index]]
+ *
+ * 执行用时：284 ms, 在所有 Kotlin 提交中击败了 98.77% 的用户
+ * 内存消耗：52 MB, 在所有 Kotlin 提交中击败了 71.60% 的用户
+ */
+class Solution {
+    fun findRepeatNumber(nums: IntArray): Int {
+        val n = nums.size
+        var i = 0
+        while (i < n) {
+            while (nums[i] != i) {
+                if (nums[i] == nums[nums[i]])
+                    return nums[i]
+                nums.swap(i)
+            }
+            i++
+        }
+        return -1
+    }
+}
+
+fun IntArray.swap(index: Int) {
+    val temp = get(index)
+    set(index, get(temp))
+    set(temp, temp)
+}
+```
+
 ### **Python3**
 
 ```python
diff --git "a/lcof/\351\235\242\350\257\225\351\242\23005. \346\233\277\346\215\242\347\251\272\346\240\274/README.md" "b/lcof/\351\235\242\350\257\225\351\242\23005. \346\233\277\346\215\242\347\251\272\346\240\274/README.md"
index 79c231e6603e2..681479564ba4b 100644
--- "a/lcof/\351\235\242\350\257\225\351\242\23005. \346\233\277\346\215\242\347\251\272\346\240\274/README.md"	
+++ "b/lcof/\351\235\242\350\257\225\351\242\23005. \346\233\277\346\215\242\347\251\272\346\240\274/README.md"	
@@ -33,6 +33,36 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```kotlin
+/**
+ * 使用 API
+ * 执行用时：232 ms, 在所有 Kotlin 提交中击败了 6.25% 的用户
+ * 内存消耗：35.7 MB, 在所有 Kotlin 提交中击败了 20.31% 的用户
+ */
+class Solution {
+    fun replaceSpace(s: String): String {
+        return s.replace(" ", "%20")
+    }
+}
+
+/**
+ * 简单遍历
+ * 执行用时：196 ms, 在所有 Kotlin 提交中击败了 12.50% 的用户
+ * 内存消耗：32.5 MB, 在所有 Kotlin 提交中击败了 93.75% 的用户
+ */
+class Solution {
+    fun replaceSpace(s: String): String {
+        val builder = StringBuilder(3 * s.length)
+        s.forEach {
+            builder.append(if (it == ' ') "%20" else it)
+        }
+        return builder.toString()
+    }
+}
+```
+
 ### **Python3**
 
 ```python
diff --git "a/lcof/\351\235\242\350\257\225\351\242\23006. \344\273\216\345\260\276\345\210\260\345\244\264\346\211\223\345\215\260\351\223\276\350\241\250/README.md" "b/lcof/\351\235\242\350\257\225\351\242\23006. \344\273\216\345\260\276\345\210\260\345\244\264\346\211\223\345\215\260\351\223\276\350\241\250/README.md"
index 1df565b535620..0df9dfa4a61e0 100644
--- "a/lcof/\351\235\242\350\257\225\351\242\23006. \344\273\216\345\260\276\345\210\260\345\244\264\346\211\223\345\215\260\351\223\276\350\241\250/README.md"	
+++ "b/lcof/\351\235\242\350\257\225\351\242\23006. \344\273\216\345\260\276\345\210\260\345\244\264\346\211\223\345\215\260\351\223\276\350\241\250/README.md"	
@@ -33,6 +33,48 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```kotlin
+/**
+ * 其实就分递归和非递归
+ * 递归版本
+ * 执行用时：244 ms, 在所有 Kotlin 提交中击败了 11.29% 的用户
+ * 内存消耗：36.4 MB, 在所有 Kotlin 提交中击败了 27.42% 的用户
+ */
+class Solution {
+    fun reversePrint(head: ListNode?): IntArray {
+        val list = mutableListOf<Int>()
+        recursion(head, list)
+        return list.toIntArray()
+    }
+}
+
+fun recursion(node: ListNode?, list: MutableList<Int>) {
+    if (node == null)
+        return
+    recursion(node.next, list)
+    list += node.`val`
+}
+
+/**
+ * 非递归，用 Stack 作为辅助的数据结构
+ * 执行用时：204 ms, 在所有 Kotlin 提交中击败了 27.42% 的用户
+ * 内存消耗：36 MB, 在所有 Kotlin 提交中击败了 51.61% 的用户
+ */
+class Solution {
+    fun reversePrint(head: ListNode?): IntArray {
+        val stack: Deque<Int> = LinkedList()
+        var node = head
+        while (node != null) {
+            stack.push(node.`val`)
+            node = node.next
+        }
+        return stack.toIntArray()
+    }
+}
+```
+
 ### **Python3**
 
 ```python
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 001. \346\225\264\346\225\260\351\231\244\346\263\225/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 001. \346\225\264\346\225\260\351\231\244\346\263\225/README.md"
index 91a58dfaee167..36e8ecfa30d46 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 001. \346\225\264\346\225\260\351\231\244\346\263\225/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 001. \346\225\264\346\225\260\351\231\244\346\263\225/README.md"	
@@ -78,6 +78,38 @@ return sign * cnt
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 理解：除法的本质其实是减法
+ * 返回值加上最大最小限制
+ */ 
+var divide = function (a, b) {
+    if (a == 0 || b == 0) return 0;
+
+    var ret = 0;
+    if (b == 1) {
+        ret = a;
+    } else if (b == -1) {
+        ret = -a;
+    } else {
+        var negative = (a < 0 && b > 0) || (a > 0 && b < 0);
+        a = Math.abs(a);
+        b = Math.abs(b);
+        while (a >= b) {
+            a -= b;
+            ret++;
+        }
+        ret = negative ? -ret : ret;
+    }
+
+    var max = Math.pow(2, 31) - 1;
+    var min = -Math.pow(2, 31);
+    return Math.max(Math.min(max, ret), min);
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 001. \346\225\264\346\225\260\351\231\244\346\263\225/Solution.js" "b/lcof2/\345\211\221\346\214\207 Offer II 001. \346\225\264\346\225\260\351\231\244\346\263\225/Solution.js"
new file mode 100644
index 0000000000000..0c4680bf73847
--- /dev/null
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 001. \346\225\264\346\225\260\351\231\244\346\263\225/Solution.js"	
@@ -0,0 +1,28 @@
+/**
+ * @param {number} a
+ * @param {number} b
+ * @return {number}
+ */
+var divide = function (a, b) {
+    if (a == 0 || b == 0) return 0;
+
+    var ret = 0;
+    if (b == 1) {
+        ret = a;
+    } else if (b == -1) {
+        ret = -a;
+    } else {
+        var negative = (a < 0 && b > 0) || (a > 0 && b < 0);
+        a = Math.abs(a);
+        b = Math.abs(b);
+        while (a >= b) {
+            a -= b;
+            ret++;
+        }
+        ret = negative ? -ret : ret;
+    }
+
+    var max = 1 << 31 - 1;
+    var min = -1 << 31;
+    return Math.max(Math.min(max, ret), min);
+};
\ No newline at end of file
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 004. \345\217\252\345\207\272\347\216\260\344\270\200\346\254\241\347\232\204\346\225\260\345\255\227/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 004. \345\217\252\345\207\272\347\216\260\344\270\200\346\254\241\347\232\204\346\225\260\345\255\227/README.md"
index 12335061b6b20..2e6455f180346 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 004. \345\217\252\345\207\272\347\216\260\344\270\200\346\254\241\347\232\204\346\225\260\345\255\227/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 004. \345\217\252\345\207\272\347\216\260\344\270\200\346\254\241\347\232\204\346\225\260\345\255\227/README.md"	
@@ -48,6 +48,34 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 遍历，并用哈希表 Map
+ * @param {number[]} nums
+ * @return {number}
+ */
+var singleNumber = function(nums) {
+    const map = new Map();
+    var value;
+    for (const num of nums) {
+        value = map.get(num);
+        if (!value) {
+            map.set(num, 2);
+        } else {
+            value--;
+            if (!value) {
+                map.delete(num);
+            } else {
+                map.set(num, value);
+            }
+        }
+    }
+    return map.keys().next().value;
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 006. \346\216\222\345\272\217\346\225\260\347\273\204\344\270\255\344\270\244\344\270\252\346\225\260\345\255\227\344\271\213\345\222\214/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 006. \346\216\222\345\272\217\346\225\260\347\273\204\344\270\255\344\270\244\344\270\252\346\225\260\345\255\227\344\271\213\345\222\214/README.md"
index 7ec8fdcd699df..77fe9507b6485 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 006. \346\216\222\345\272\217\346\225\260\347\273\204\344\270\255\344\270\244\344\270\252\346\225\260\345\255\227\344\271\213\345\222\214/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 006. \346\216\222\345\272\217\346\225\260\347\273\204\344\270\255\344\270\244\344\270\252\346\225\260\345\255\227\344\271\213\345\222\214/README.md"	
@@ -58,6 +58,26 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 非常经典的【两数之和 twoSum】
+ * 数组 + 双指针的入门
+ */
+var twoSum = function(numbers, target) {
+    for (let l = 0, r = numbers.length - 1;;) {
+        if (numbers[l] + numbers[r] > target) {
+            r--;
+        } else if (numbers[l] + numbers[r] < target) {
+            l++;
+        } else {
+            return [l, r];
+        }
+    }
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 007. \346\225\260\347\273\204\344\270\255\345\222\214\344\270\272 0 \347\232\204\344\270\211\344\270\252\346\225\260/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 007. \346\225\260\347\273\204\344\270\255\345\222\214\344\270\272 0 \347\232\204\344\270\211\344\270\252\346\225\260/README.md"
index 066c2b3ffca29..e16d22235cf0a 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 007. \346\225\260\347\273\204\344\270\255\345\222\214\344\270\272 0 \347\232\204\344\270\211\344\270\252\346\225\260/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 007. \346\225\260\347\273\204\344\270\255\345\222\214\344\270\272 0 \347\232\204\344\270\211\344\270\252\346\225\260/README.md"	
@@ -50,6 +50,43 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 理解：三数之和的本质其实是【两数之和 twoSum】加多一个变量
+ * 两数之和关键点：排序、头尾双指针往中间逼近
+ * 所以这里首先排序，然后固定住 x，那么 y 和 z 其实就是两数之和的算法模板
+ * 注意去重
+ * @param {number[]} nums
+ * @return {number[][]}
+ */
+var threeSum = function(nums) {
+    var ret = new Array();
+    if (!nums || nums.length < 3) return ret;
+
+    nums.sort((l, r) => l - r);
+    for (let i = 0; i < nums.length - 2;) {
+        for (let j = i + 1, k = nums.length - 1; j < k;) {
+            let sum = nums[i] + nums[j] + nums[k];
+
+            if (sum < 0) {
+                j++;
+            } else if (sum > 0) {
+                k--;
+            } else {
+                ret.push([nums[i], nums[j], nums[k]]);
+                for (let diff = nums[j]; diff == nums[j] && j < k; j++) {}
+                for (let diff = nums[k]; diff == nums[k] && j < k; k--) {}
+            }
+        }
+        for (let diff = nums[i]; diff == nums[i] && i < nums.length - 2; i++) {}
+    }
+
+    return ret;
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 008. \345\222\214\345\244\247\344\272\216\347\255\211\344\272\216 target \347\232\204\346\234\200\347\237\255\345\255\220\346\225\260\347\273\204/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 008. \345\222\214\345\244\247\344\272\216\347\255\211\344\272\216 target \347\232\204\346\234\200\347\237\255\345\255\220\346\225\260\347\273\204/README.md"
index 79b4d5d79b09e..3c46f74b0cd3c 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 008. \345\222\214\345\244\247\344\272\216\347\255\211\344\272\216 target \347\232\204\346\234\200\347\237\255\345\255\220\346\225\260\347\273\204/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 008. \345\222\214\345\244\247\344\272\216\347\255\211\344\272\216 target \347\232\204\346\234\200\347\237\255\345\255\220\346\225\260\347\273\204/README.md"	
@@ -60,6 +60,39 @@
 
 <!-- tabs:start -->
 
+
+### **Cyrus**
+
+```javascript
+/**
+ * 求连续子数组、区间的问题一般可以用：滑动窗口、双指针、前缀和
+ * 
+ * 此问题虽然数组未排序，但其元素都是正整数就保证了：增加窗口 sum 增大，减小窗口 sum 减小
+ * 而滑动窗口的关键操作就是增大/减小窗口
+ * 
+ * 前缀和解法
+ * 指针 j 遍历数组，其作为目标区间的结束标志
+ * 当区间和 sum >= k 时，即存在和 >= k 的一个或多个区间，此时只要二分搜索前缀和数组，找到小于 sum - k 的极大值 pres[i]
+ * [i + 1, j] 就是区间 [0, j] 里满足条件的最短区间
+ * 
+ * @param {number} target
+ * @param {number[]} nums
+ * @return {number}
+ */
+var minSubArrayLen = function(target, nums) {
+    var ret = Number.MAX_VALUE;
+    for (let i = 0, j = 0, sum = 0; j < nums.length; j++) {
+        sum += nums[j];
+        while (sum >= target && i <= j) {
+            ret = Math.min(ret, j - i + 1);
+            sum -= nums[i];
+            i++;
+        }
+    }
+    return ret == Number.MAX_VALUE ? 0 : ret;
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 009. \344\271\230\347\247\257\345\260\217\344\272\216 K \347\232\204\345\255\220\346\225\260\347\273\204/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 009. \344\271\230\347\247\257\345\260\217\344\272\216 K \347\232\204\345\255\220\346\225\260\347\273\204/README.md"
index 76dcfb156002e..8d2d59f913961 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 009. \344\271\230\347\247\257\345\260\217\344\272\216 K \347\232\204\345\255\220\346\225\260\347\273\204/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 009. \344\271\230\347\247\257\345\260\217\344\272\216 K \347\232\204\345\255\220\346\225\260\347\273\204/README.md"	
@@ -45,6 +45,37 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 目标是连续子数组，即区间，首先想到滑动窗口
+ * 
+ * 滑动窗口 [i, j] 流程是 j 往右增大窗口，固定 j 的同时 i 不断往右收缩窗口
+ * 条件是：
+ * 1，增大窗口/减小窗口导致的结果需始终方向一致，这里是正整数的乘积，增大窗口乘积肯定增大，同理减小窗口乘积肯定减小
+ * 2，增大窗口和减小窗口操作的方向是相反的，如上所述一个是增大一个是减小
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {number}
+ */
+var numSubarrayProductLessThanK = function(nums, k) {
+    var ret = 0;
+    for (let i = 0, j = 0, mul = 1; j < nums.length; j++) {
+        mul = mul * nums[j];
+        while (mul >= k && i <= j) {  // 减小窗口直至 mul < k
+            mul = mul / nums[i];      // 此时增大窗口，j 往右移会导致 mul 始终比 k 大，没有意义
+            i++;
+        }
+        if (mul < k) {  // 当区间 [i, j] 的乘积 mul < k 时，减小窗口 mul 会越来越小
+            ret += j - i + 1;  // 所以 [i + 1, j]、[i + 2, j]、[i + 3, j]... 也是满足条件的
+            continue;
+        }
+    }
+    return ret;
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 010. \345\222\214\344\270\272 k \347\232\204\345\255\220\346\225\260\347\273\204/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 010. \345\222\214\344\270\272 k \347\232\204\345\255\220\346\225\260\347\273\204/README.md"
index bb924637f6200..5cb864205e6fb 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 010. \345\222\214\344\270\272 k \347\232\204\345\255\220\346\225\260\347\273\204/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 010. \345\222\214\344\270\272 k \347\232\204\345\255\220\346\225\260\347\273\204/README.md"	
@@ -4,7 +4,7 @@
 
 <!-- 这里写题目描述 -->
 
-<p>给定一个正整数数组和一个整数&nbsp;<code>k</code><strong> ，</strong>请找到该数组中和为&nbsp;<code>k</code><strong>&nbsp;</strong>的连续子数组的个数。</p>
+<p>给定一个整数数组和一个整数&nbsp;<code>k</code><strong> ，</strong>请找到该数组中和为&nbsp;<code>k</code><strong>&nbsp;</strong>的连续子数组的个数。</p>
 
 <p>&nbsp;</p>
 
@@ -47,6 +47,49 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 从某一符合条件的情形里推导出规则：
+ * 既然是连续的子数组，那么它的样子大概是这样的：
+ * |     pre     |  section  | suf |
+ * ---------------------------------
+ *               x           y
+ * 
+ * 假设满足条件（和为 k）的连续区间为 section [x, y]，那么 x 和 y 就会把整个数组切分为三部分：
+ * 1，前缀区间 pre
+ * 2，和为 k 的区间 section
+ * 3，后缀区间 suf
+ * 
+ * 在遍历数组 nums 的过程中，cnt 是已遍历区间 pre + section 的和，将目标区间 section 的 y 固定为当前索引
+ * 那么就是要找到这么一个 x 使得：pre + section = cnt = sum(0, x) + k
+ * cnt 已知（累加），k 已知，那么 pre = cnt - k，问题就转化为要找到和为 cnt - k 的前缀区间，也即前缀和
+ * 而前缀和在遍历数组进行累加操作时已经算出来了，只需要将这些前缀和保存到一个 map 里，方便后续的查找
+ * 
+ * 直观的解法是使用 i 和 j 两个指针双重循环遍历 nums，计算 [i, j] 的和是否为 k
+ * 这种解法相当于固定 section 区间的开始索引 x，计算结束索引 y
+ * 想要设计出上面这种思路，必须颠倒一般思路：固定 section 区间的结束索引 y，计算开始索引 x，因为前缀和是可以复用的
+ * 
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {number}
+ */
+var subarraySum = function(nums, k) {
+    var map = new Map(), cnt = 0, hits = 0, pre = 0;
+    map.set(0, 1);
+    for (const num of nums) {
+        cnt += num;
+        pre = cnt - k;
+        if (map.get(pre)) {
+            hits += map.get(pre);
+        }
+        map.set(cnt, (map.get(cnt) ? map.get(cnt) : 0) + 1);
+    }
+    return hits;
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 012. \345\267\246\345\217\263\344\270\244\350\276\271\345\255\220\346\225\260\347\273\204\347\232\204\345\222\214\347\233\270\347\255\211/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 012. \345\267\246\345\217\263\344\270\244\350\276\271\345\255\220\346\225\260\347\273\204\347\232\204\345\222\214\347\233\270\347\255\211/README.md"
index 01f3ddfee97b3..9522a822838dd 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 012. \345\267\246\345\217\263\344\270\244\350\276\271\345\255\220\346\225\260\347\273\204\347\232\204\345\222\214\347\233\270\347\255\211/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 012. \345\267\246\345\217\263\344\270\244\350\276\271\345\255\220\346\225\260\347\273\204\347\232\204\345\222\214\347\233\270\347\255\211/README.md"	
@@ -64,6 +64,32 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 其实这里不是必须用上前缀和
+ * 左子集累加，右子集 = 总和 - 当前位置 - 左子集
+ * @param {number[]} nums
+ * @return {number}
+ */
+var pivotIndex = function(nums) {
+    if (!nums) return -1;
+    var c = 0;
+    for (const num of nums) {
+        c += num;
+    }
+
+    var lc = 0, rc = 0;
+    for (let i = 0; i < nums.length; i++) {
+        lc += (i - 1 >= 0 ? nums[i - 1] : 0);
+        rc = c - nums[i] - lc;
+        if (lc == rc) return i;
+    }
+    return -1;
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 018. \346\234\211\346\225\210\347\232\204\345\233\236\346\226\207/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 018. \346\234\211\346\225\210\347\232\204\345\233\236\346\226\207/README.md"
index 1ab9aa2ce53de..277daf0233b9b 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 018. \346\234\211\346\225\210\347\232\204\345\233\236\346\226\207/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 018. \346\234\211\346\225\210\347\232\204\345\233\236\346\226\207/README.md"	
@@ -43,6 +43,60 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 剑指 Offer II 018. 有效的回文
+ * 
+ * 字符串是字符的数组，判断回文就用头尾双指针
+ * 
+ * 一些额外的规则：跳过 [0-9a-zA-Z] 和忽略大小写
+ * 可以用 ASCII 码转换为数学计算比较快
+ * 
+ * 执行结果：通过 显示详情 你的代码真是无敌了！
+ * 执行用时：52 ms, 在所有 JavaScript 提交中击败了 100.00% 的用户
+ * 内存消耗：41.8 MB, 在所有 JavaScript 提交中击败了 98.56% 的用户
+ * 
+ * ASCII:
+ * 0: 48, 9: 57
+ * a: 97, z: 122
+ * A: 65, Z: 90 
+ * 
+ * @param {string} s
+ * @return {boolean}
+ */
+var isPalindrome = function(s) {
+    if (!s) return false;
+    var isNumber = function(code) {
+        return code >= 48 && code <= 57;
+    }
+    var isValid = function(code) {
+        return isNumber(code) || (code >= 97 && code <= 122) || (code >= 65 && code <= 90); 
+    }
+    for (let l = 0, r = s.length - 1, lc = 0, rc = 0; l < r;) {
+        lc = s.codePointAt(l);
+        rc = s.codePointAt(r);
+        
+        if (!isValid(lc)) {
+            l++;
+            continue;
+        }
+        if (!isValid(rc)) {
+            r--;
+            continue;
+        }
+        if ((lc == rc) || (!isNumber(lc) && !isNumber(rc) && Math.abs(lc - rc) == 32)) {
+            l++;
+            r--;
+            continue;
+        }
+        return false;
+    }
+    return true;
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 021. \345\210\240\351\231\244\351\223\276\350\241\250\347\232\204\345\200\222\346\225\260\347\254\254 n \344\270\252\347\273\223\347\202\271/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 021. \345\210\240\351\231\244\351\223\276\350\241\250\347\232\204\345\200\222\346\225\260\347\254\254 n \344\270\252\347\273\223\347\202\271/README.md"
index 2ee890a05cc7c..f90aa938d71d4 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 021. \345\210\240\351\231\244\351\223\276\350\241\250\347\232\204\345\200\222\346\225\260\347\254\254 n \344\270\252\347\273\223\347\202\271/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 021. \345\210\240\351\231\244\351\223\276\350\241\250\347\232\204\345\200\222\346\225\260\347\254\254 n \344\270\252\347\273\223\347\202\271/README.md"	
@@ -58,6 +58,49 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+
+/**
+ * 剑指 Offer II 021. 删除链表的倒数第 n 个结点
+ * 
+ * 快慢指针，解决链表没有前向指针导致不能后退只能前进的问题
+ * 设计思路：控制快慢两个指针间的距离，当快指针到达链表尾结点时，使慢指针刚好处于目标节点
+ * 
+ * 用前进步数 step 计数，n 是从 1 开始的，那么快慢指针的间距为 n - 1
+ * 
+ * @param {ListNode} head
+ * @param {number} n
+ * @return {ListNode}
+ */
+var removeNthFromEnd = function(head, n) {
+    if (!head) return head;
+    var fast = head, slow = head, step = 0;
+
+    while (fast.next && step < n) {  // 快指针先走 n - 1 步
+        fast = fast.next;
+        step++;
+    }
+    while (fast.next) {  // 然后快慢指针同时前进
+        fast = fast.next;
+        slow = slow.next;
+    }
+
+    if (step == 0) return null;  // special case: 只有一个元素
+    if (step + 1 == n) return head.next;  // special case: 移除倒数第 len(head) 个元素，即移除链表头
+    slow.next = slow.next.next;
+    return head;
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 022. \351\223\276\350\241\250\344\270\255\347\216\257\347\232\204\345\205\245\345\217\243\350\212\202\347\202\271/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 022. \351\223\276\350\241\250\344\270\255\347\216\257\347\232\204\345\205\245\345\217\243\350\212\202\347\202\271/README.md"
index 4a539f52883a3..f71dc86077719 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 022. \351\223\276\350\241\250\344\270\255\347\216\257\347\232\204\345\205\245\345\217\243\350\212\202\347\202\271/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 022. \351\223\276\350\241\250\344\270\255\347\216\257\347\232\204\345\205\245\345\217\243\350\212\202\347\202\271/README.md"	
@@ -83,6 +83,52 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val) {
+ *     this.val = val;
+ *     this.next = null;
+ * }
+ */
+
+/**
+ * 剑指 Offer II 022. 链表中环的入口节点
+ * 
+ * 背景知识：快慢指针可以用来判断链表是否有环
+ * 快指针每次两步，慢指针每次一步，同时从链头出发，如果能够相遇则说明有环
+ * 
+ * 那链头节点和环入口节点间有什么关系呢？画图总结规律：
+ *         fast: 1 2 3 4 5 6 7 4 5 6 7 4 5 6 7 4 5 6 7
+ * slow round 1: 1   2   3   4   5
+ * slow round 2:                 1 2 3 4 
+ * 
+ * 
+ * 
+ * 
+ * @param {ListNode} head
+ * @return {ListNode}
+ */
+var detectCycle = function(head) {
+    var fast = head, slow = head;
+    while (true) {  // 快指针两步，慢指针一步，直到相遇
+        if (!fast || !fast.next) return null;
+        fast = fast.next.next;
+        slow = slow.next;
+        if (fast === slow) break;
+    }
+
+    slow = head;
+    while (true) {  // 慢指针回到链头继续走，直到和快指针相遇
+        if (fast === slow) return fast;
+        fast = fast.next;
+        slow = slow.next;
+    }
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 024. \345\217\215\350\275\254\351\223\276\350\241\250/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 024. \345\217\215\350\275\254\351\223\276\350\241\250/README.md"
index 79c40c3472167..ad5985a8b889c 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 024. \345\217\215\350\275\254\351\223\276\350\241\250/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 024. \345\217\215\350\275\254\351\223\276\350\241\250/README.md"	
@@ -60,6 +60,34 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * 剑指 Offer II 024. 反转链表
+ * 
+ * 递归的典型例题，利用方法调用栈作为数据结构的栈保存节点
+ * 
+ * @param {ListNode} head
+ * @return {ListNode}
+ */
+var reverseList = function(head) {
+    if (!head || !head.next) return head;
+    var node = head;
+    head = reverseList(head.next);
+    node.next.next = node;
+    node.next = null;
+    return head;
+};
+```
+
 ### **Python3**
 
 ```python
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 027. \345\233\236\346\226\207\351\223\276\350\241\250/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 027. \345\233\236\346\226\207\351\223\276\350\241\250/README.md"
index a8a6eb7057a8d..ff9dd81f426b9 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 027. \345\233\236\346\226\207\351\223\276\350\241\250/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 027. \345\233\236\346\226\207\351\223\276\350\241\250/README.md"	
@@ -52,6 +52,41 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * 剑指 Offer II 027. 回文链表
+ * 
+ * 1，遍历链表，将链表拷贝到数组，通过双指针头尾逼近判断是否回文
+ * 2，遍历链表并入栈，依次出栈对比，通过先进后出的特性翻转链表
+ * 
+ * 比较有挑战性的是不使用额外的数据结构/空间：
+ * 1，递归，通过调用栈反向迭代节点，同时使用递归函数外的变量向前迭代
+ * 
+ * @param {ListNode} head
+ * @return {boolean}
+ */
+var isPalindrome = function(head) {
+    var cur = head, tmp = false;
+    function recursion(node) {
+        if (!node) return true;
+        if (!recursion(node.next)) return false;
+        tmp = node.val == cur.val;
+        cur = cur.next;
+        return tmp;
+    };
+    return recursion(head);
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 044. \344\272\214\345\217\211\346\240\221\346\257\217\345\261\202\347\232\204\346\234\200\345\244\247\345\200\274/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 044. \344\272\214\345\217\211\346\240\221\346\257\217\345\261\202\347\232\204\346\234\200\345\244\247\345\200\274/README.md"
index d9736e7ff2045..b122f8142f16a 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 044. \344\272\214\345\217\211\346\240\221\346\257\217\345\261\202\347\232\204\346\234\200\345\244\247\345\200\274/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 044. \344\272\214\345\217\211\346\240\221\346\257\217\345\261\202\347\232\204\346\234\200\345\244\247\345\200\274/README.md"	
@@ -78,6 +78,52 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 剑指 Offer II 044. 二叉树每层的最大值
+ * 
+ * 广度优先（BFS）逐层遍历二叉树
+ * 
+ * Definition for a binary tree node.
+ * function TreeNode(val, left, right) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.left = (left===undefined ? null : left)
+ *     this.right = (right===undefined ? null : right)
+ * }
+ */
+/**
+ * @param {TreeNode} root
+ * @return {number[]}
+ */
+var largestValues = function(root) {
+    if (!root) return [];
+    var ret = new Array(), max, nodes = [root];
+    var bfs = function() {
+        if (nodes.length == 0) return;
+        var children = new Array();
+        max = Number.NEGATIVE_INFINITY;
+        for (const node of nodes) {
+            max = Math.max(max, node.val);
+            if (node.left) {
+                children.push(node.left);
+            }
+            if (node.right) {
+                children.push(node.right);
+            }
+        }
+        ret.push(max);
+        nodes = children;
+        bfs();
+    };
+    bfs();
+    return ret;
+};
+
+
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 074. \345\220\210\345\271\266\345\214\272\351\227\264/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 074. \345\220\210\345\271\266\345\214\272\351\227\264/README.md"
index 4969594115fe9..4925ea48c46d6 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 074. \345\220\210\345\271\266\345\214\272\351\227\264/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 074. \345\220\210\345\271\266\345\214\272\351\227\264/README.md"	
@@ -64,6 +64,42 @@ def merge(intervals):
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 目标：合并所有有交集的区间（返回的区间两两不能有交集）
+ * 明确区间合并的三种情况：
+ *   ---- | ---- | ---- 
+ * ----   |  --  |    ----
+ * 
+ * 如果不排序，需要两两对比
+ * 
+ * 对区间的开始位置排序后，将区间集合遍历一次即可，前后两个相邻区间进行合并操作
+ * 相当于将上面的三种情况减少到后两种情况
+ * 如果 i 和 i + 1 不能合并，那么 i 与 i + 2 及之后的区间也不能合并，因为区间的起始位置是升序排序的
+ * 
+ * @param {number[][]} intervals
+ * @return {number[][]}
+ */
+var merge = function(intervals) {
+    if (!intervals || intervals.length < 2) return intervals;
+
+    intervals.sort((l, r) => l[0] - r[0]);
+    var ret = new Array(), cur = intervals[0];
+    for (let i = 1; i < intervals.length; i++) {
+        if (intervals[i][0] > cur[1]) {
+            ret.push(cur);
+            cur = intervals[i];
+            continue;
+        }
+        cur[1] = intervals[i][1] > cur[1] ? intervals[i][1] : cur[1];
+    }
+    ret.push(cur);
+    return ret;
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 083. \346\262\241\346\234\211\351\207\215\345\244\215\345\205\203\347\264\240\351\233\206\345\220\210\347\232\204\345\205\250\346\216\222\345\210\227/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 083. \346\262\241\346\234\211\351\207\215\345\244\215\345\205\203\347\264\240\351\233\206\345\220\210\347\232\204\345\205\250\346\216\222\345\210\227/README.md"
index 5c7f1be4d840d..853bf2038165e 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 083. \346\262\241\346\234\211\351\207\215\345\244\215\345\205\203\347\264\240\351\233\206\345\220\210\347\232\204\345\205\250\346\216\222\345\210\227/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 083. \346\262\241\346\234\211\351\207\215\345\244\215\345\205\203\347\264\240\351\233\206\345\220\210\347\232\204\345\205\250\346\216\222\345\210\227/README.md"	
@@ -51,6 +51,44 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 剑指 Offer II 083. 没有重复元素集合的全排列
+ * 
+ * 排列不是子数组，排列跟次序无关
+ * 举个例子 [0, 1, 2] 写出它的全排列，发现是个暴力枚举的过程，那么就用回溯
+ * 
+ * 回溯 = 用递归实现暴力枚举
+ * 
+ * @param {number[]} nums
+ * @return {number[][]}
+ */
+var permute = function(nums) {
+    if (!nums || nums.length == 0) return [];
+    var ret = new Array(), len = nums.length, ans = new Array(nums.length), selected = new Map();
+    var recursion = function(ansIdx) {
+        for (let i = 0; i < len; i++) {
+            if (selected.has(nums[i])) {
+                continue;
+            }
+            ans[ansIdx] = nums[i];
+            selected.set(nums[i], true);
+            
+            if (ansIdx == len - 1) {
+                ret.push(Array.from(ans));
+            } else {
+                recursion(ansIdx + 1)
+            }
+            selected.delete(nums[i]);
+        }
+    };
+    recursion(0);
+    return ret;
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 087. \345\244\215\345\216\237 IP/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 087. \345\244\215\345\216\237 IP/README.md"
index f478cf6fb678f..fc6a6aefae894 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 087. \345\244\215\345\216\237 IP/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 087. \345\244\215\345\216\237 IP/README.md"	
@@ -68,6 +68,43 @@ DFS。
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 剑指 Offer II 087. 复原 IP 
+ * 
+ * 回溯，其实就是暴力枚举 + 递归
+ * 
+ * @param {string} s
+ * @return {string[]}
+ */
+var restoreIpAddresses = function(s) {
+    if (!s || s.length == 0) return [];
+    const zero = 48, len = s.length;
+    var ret = new Array() /* 返回值 */, ip = new Array(4) /* ip 地址的四个部分 */;
+    var recursion = function(ipIdx, start) {
+
+        if (ipIdx == 4) {
+            if (start == len) {
+                ret.push(ip.join('.'));  // 填满 ip 的四个部分，同时用完字符串，才算满足条件
+            }
+            return;
+        }
+
+        for (let i = start, count = 0; i < len; i++) {
+            count = count * 10 + (s.codePointAt(i) - zero)
+            // ip 地址的每个部分 0 <= ip[idx] <= 255，且不能以 0 开头
+            if (count > 255 || (i > start && s.codePointAt(start) == zero)) break;
+            ip[ipIdx] = count;
+            recursion(ipIdx + 1, i + 1);
+        }
+    };
+    recursion(0, 0)
+    return ret;
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 095. \346\234\200\351\225\277\345\205\254\345\205\261\345\255\220\345\272\217\345\210\227/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 095. \346\234\200\351\225\277\345\205\254\345\205\261\345\255\220\345\272\217\345\210\227/README.md"
index 1397a8e6ce976..cd5714695a57a 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 095. \346\234\200\351\225\277\345\205\254\345\205\261\345\255\220\345\272\217\345\210\227/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 095. \346\234\200\351\225\277\345\205\254\345\205\261\345\255\220\345\272\217\345\210\227/README.md"	
@@ -69,6 +69,95 @@
 
 <!-- tabs:start -->
 
+### **Cyrus**
+
+```javascript
+/**
+ * 剑指 Offer II 095. 最长公共子序列
+ * 
+ * 动态规划的典型例题，可以作为一个模板，通过这道题了解动态规划的流程个概念
+ * 
+ * 1）定义 dp 数组
+ * 
+ * dp 是个二维数组，dp[i][j] 表示 text1 长度为 i 的前缀，和 text2 长度为 j 的前缀，的最长公共子序列
+ * 所以 max(i) = text1.length + 1
+ * 
+ * 2）状态转移方程
+ * 
+ * 考虑如何计算任一格子的值 dp[i][j]
+ * dp[i - 1][j - 1]、dp[i - 1][j] 和 dp[i][j - 1] 是已知的，我们需要找出规律（状态转移方程），通过它们计算出 dp[i][j]
+ * 对于 text1[i - 1] 和 text2[j - 1]，如果它们相等，那么相当于使 text1[i - 2] 和 text2[j - 2] 的最长公共子序列 + 1，即 dp[i - 1][j - 1] + 1
+ * 如果不相等则不能使 dp[i - 1][j - 1] 增长，此时应该取 dp[i][j - 1] 和 dp[i - 1][j] 的最大值
+ * 如果 i == 0 or j == 0 表示空前缀，取 0
+ * 
+ * 
+ * @param {string} text1
+ * @param {string} text2
+ * @return {number}
+ */
+var longestCommonSubsequence = function(text1, text2) {
+    if (!text1 || !text2) return 0;
+
+    var m = text1.length + 1, n = text2.length + 1;
+    var dp = new Array(m);
+    for (let i = 0; i < dp.length; i++) {
+        dp[i] = new Array(n);
+    }
+
+    for (let i = 0; i < m; i++) {
+        for (let j = 0; j < n; j++) {
+            if (i == 0 || j == 0) {
+                dp[i][j] = 0;
+                continue;
+            }
+
+            if (text1[i - 1] == text2[j - 1]) {
+                dp[i][j] = dp[i - 1][j - 1] + 1;
+                continue;
+            }
+
+            dp[i][j] = Math.max(dp[i - 1][j], dp[i][j - 1]);
+        }
+    }
+    return dp[m - 1][n - 1];
+};
+
+/**
+ * 3）压缩 dp 数组
+ * 
+ * 考虑到每次计算 dp[i][j] 只需用到当前行和上一行，那么可以用两行替代二维数组 dp
+ * 
+ * 每次计算 Math.max(左边, 上边) 时，左边就是 dp[j - 1]，上边就是 dp[j]
+ * 
+ * 但计算【左上 + 1】时就有问题了，此时【左上】已经被【左】覆盖了，所以需要用 prev 保留上一行 
+ * 
+ * @param {string} text1
+ * @param {string} text2
+ * @return {number}
+ */
+var longestCommonSubsequence = function(text1, text2) {
+    if (!text1 || !text2) return 0;
+
+    var m = text1.length + 1, n = text2.length + 1;
+    var dp = new Array(n);
+
+    for (let i = 0, prev; i < m; i++) {
+        for (let j = 0; j < n; j++) {
+            if (i == 0 || j == 0) {
+                dp[j] = 0;
+            } else if (text1[i - 1] == text2[j - 1]) {
+                dp[j] = prev[j - 1] + 1;
+            } else {
+                dp[j] = Math.max(dp[j], dp[j - 1]);
+            }
+            tmp = dp[j];
+        }
+        prev = Array.from(dp);
+    }
+    return dp[n - 1];
+};
+```
+
 ### **Python3**
 
 <!-- 这里可写当前语言的特殊实现逻辑 -->
diff --git a/package-lock.json b/package-lock.json
index 95b37c50ebea0..c75a62b4782c9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,65 +1,92 @@
 {
+  "name": "leetcode",
+  "lockfileVersion": 3,
   "requires": true,
-  "lockfileVersion": 1,
-  "dependencies": {
-    "@sindresorhus/is": {
+  "packages": {
+    "": {
+      "dependencies": {
+        "docsify-cli": "^4.4.4"
+      }
+    },
+    "node_modules/@sindresorhus/is": {
       "version": "0.14.0",
       "resolved": "https://registry.npmmirror.com/@sindresorhus/is/-/is-0.14.0.tgz",
-      "integrity": "sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ=="
+      "integrity": "sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ==",
+      "engines": {
+        "node": ">=6"
+      }
     },
-    "@szmarczak/http-timer": {
+    "node_modules/@szmarczak/http-timer": {
       "version": "1.1.2",
       "resolved": "https://registry.npmmirror.com/@szmarczak/http-timer/-/http-timer-1.1.2.tgz",
       "integrity": "sha512-XIB2XbzHTN6ieIjfIMV9hlVcfPU26s2vafYWQcZHWXHOxiaRZYEDKEwdl129Zyg50+foYV2jCgtrqSA6qNuNSA==",
-      "requires": {
+      "dependencies": {
         "defer-to-connect": "^1.0.1"
+      },
+      "engines": {
+        "node": ">=6"
       }
     },
-    "ansi-align": {
+    "node_modules/ansi-align": {
       "version": "3.0.1",
       "resolved": "https://registry.npmmirror.com/ansi-align/-/ansi-align-3.0.1.tgz",
       "integrity": "sha512-IOfwwBF5iczOjp/WeY4YxyjqAFMQoZufdQWDd19SEExbVLNXqvpzSJ/M7Za4/sCPmQ0+GRquoA7bGcINcxew6w==",
-      "requires": {
+      "dependencies": {
         "string-width": "^4.1.0"
       }
     },
-    "ansi-colors": {
+    "node_modules/ansi-colors": {
       "version": "4.1.3",
       "resolved": "https://registry.npmmirror.com/ansi-colors/-/ansi-colors-4.1.3.tgz",
-      "integrity": "sha512-/6w/C21Pm1A7aZitlI5Ni/2J6FFQN8i1Cvz3kHABAAbw93v/NlvKdVOqz7CCWz/3iv/JplRSEEZ83XION15ovw=="
+      "integrity": "sha512-/6w/C21Pm1A7aZitlI5Ni/2J6FFQN8i1Cvz3kHABAAbw93v/NlvKdVOqz7CCWz/3iv/JplRSEEZ83XION15ovw==",
+      "engines": {
+        "node": ">=6"
+      }
     },
-    "ansi-regex": {
+    "node_modules/ansi-regex": {
       "version": "5.0.1",
       "resolved": "https://registry.npmmirror.com/ansi-regex/-/ansi-regex-5.0.1.tgz",
-      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ=="
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "engines": {
+        "node": ">=8"
+      }
     },
-    "ansi-styles": {
+    "node_modules/ansi-styles": {
       "version": "3.2.1",
       "resolved": "https://registry.npmmirror.com/ansi-styles/-/ansi-styles-3.2.1.tgz",
       "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-      "requires": {
+      "dependencies": {
         "color-convert": "^1.9.0"
+      },
+      "engines": {
+        "node": ">=4"
       }
     },
-    "anymatch": {
+    "node_modules/anymatch": {
       "version": "3.1.2",
       "resolved": "https://registry.npmmirror.com/anymatch/-/anymatch-3.1.2.tgz",
       "integrity": "sha512-P43ePfOAIupkguHUycrc4qJ9kz8ZiuOUijaETwX7THt0Y/GNK7v0aa8rY816xWjZ7rJdA5XdMcpVFTKMq+RvWg==",
-      "requires": {
+      "dependencies": {
         "normalize-path": "^3.0.0",
         "picomatch": "^2.0.4"
+      },
+      "engines": {
+        "node": ">= 8"
       }
     },
-    "binary-extensions": {
+    "node_modules/binary-extensions": {
       "version": "2.2.0",
       "resolved": "https://registry.npmmirror.com/binary-extensions/-/binary-extensions-2.2.0.tgz",
-      "integrity": "sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA=="
+      "integrity": "sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA==",
+      "engines": {
+        "node": ">=8"
+      }
     },
-    "boxen": {
+    "node_modules/boxen": {
       "version": "4.2.0",
       "resolved": "https://registry.npmmirror.com/boxen/-/boxen-4.2.0.tgz",
       "integrity": "sha512-eB4uT9RGzg2odpER62bBwSLvUeGC+WbRjjyyFhGsKnc8wp/m0+hQsMUvUe3H2V0D5vw0nBdO1hCJoZo5mKeuIQ==",
-      "requires": {
+      "dependencies": {
         "ansi-align": "^3.0.0",
         "camelcase": "^5.3.1",
         "chalk": "^3.0.0",
@@ -69,65 +96,90 @@
         "type-fest": "^0.8.1",
         "widest-line": "^3.1.0"
       },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/boxen/node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmmirror.com/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
       "dependencies": {
-        "ansi-styles": {
-          "version": "4.3.0",
-          "resolved": "https://registry.npmmirror.com/ansi-styles/-/ansi-styles-4.3.0.tgz",
-          "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
-          "requires": {
-            "color-convert": "^2.0.1"
-          }
-        },
-        "chalk": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmmirror.com/chalk/-/chalk-3.0.0.tgz",
-          "integrity": "sha512-4D3B6Wf41KOYRFdszmDqMCGq5VV/uMAB273JILmO+3jAlh8X4qDtdtgCR3fxtbLEMzSx22QdhnDcJvu2u1fVwg==",
-          "requires": {
-            "ansi-styles": "^4.1.0",
-            "supports-color": "^7.1.0"
-          }
-        },
-        "color-convert": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmmirror.com/color-convert/-/color-convert-2.0.1.tgz",
-          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
-          "requires": {
-            "color-name": "~1.1.4"
-          }
-        },
-        "color-name": {
-          "version": "1.1.4",
-          "resolved": "https://registry.npmmirror.com/color-name/-/color-name-1.1.4.tgz",
-          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
-        },
-        "has-flag": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmmirror.com/has-flag/-/has-flag-4.0.0.tgz",
-          "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ=="
-        },
-        "supports-color": {
-          "version": "7.2.0",
-          "resolved": "https://registry.npmmirror.com/supports-color/-/supports-color-7.2.0.tgz",
-          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
-          "requires": {
-            "has-flag": "^4.0.0"
-          }
-        }
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/boxen/node_modules/chalk": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmmirror.com/chalk/-/chalk-3.0.0.tgz",
+      "integrity": "sha512-4D3B6Wf41KOYRFdszmDqMCGq5VV/uMAB273JILmO+3jAlh8X4qDtdtgCR3fxtbLEMzSx22QdhnDcJvu2u1fVwg==",
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/boxen/node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmmirror.com/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/boxen/node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmmirror.com/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
+    },
+    "node_modules/boxen/node_modules/has-flag": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmmirror.com/has-flag/-/has-flag-4.0.0.tgz",
+      "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/boxen/node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmmirror.com/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
       }
     },
-    "braces": {
+    "node_modules/braces": {
       "version": "3.0.2",
       "resolved": "https://registry.npmmirror.com/braces/-/braces-3.0.2.tgz",
       "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
-      "requires": {
+      "dependencies": {
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+      },
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+        "node": ">=8"
       }
     },
-    "cacheable-request": {
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       "version": "6.1.0",
       "resolved": "https://registry.npmmirror.com/cacheable-request/-/cacheable-request-6.1.0.tgz",
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@@ -136,189 +188,257 @@
         "normalize-url": "^4.1.0",
         "responselike": "^1.0.2"
       },
+      "engines": {
+        "node": ">=8"
+      }
+    },
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-        }
+        "pump": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "camelcase": {
+    "node_modules/cacheable-request/node_modules/lowercase-keys": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmmirror.com/lowercase-keys/-/lowercase-keys-2.0.0.tgz",
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+      }
+    },
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       "resolved": "https://registry.npmmirror.com/camelcase/-/camelcase-5.3.1.tgz",
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+      }
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       "resolved": "https://registry.npmmirror.com/chalk/-/chalk-2.4.2.tgz",
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       "resolved": "https://registry.npmmirror.com/chokidar/-/chokidar-3.5.3.tgz",
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-      "requires": {
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+          "type": "individual",
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+        }
+      ],
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+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
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       "resolved": "https://registry.npmmirror.com/clone-response/-/clone-response-1.0.2.tgz",
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+      }
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+      "engines": {
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       }
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-    "defer-to-connect": {
+    "node_modules/defer-to-connect": {
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-    "depd": {
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       "resolved": "https://registry.npmmirror.com/depd/-/depd-2.0.0.tgz",
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+        "node": ">= 0.8"
+      }
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-    "destroy": {
+    "node_modules/destroy": {
       "version": "1.2.0",
       "resolved": "https://registry.npmmirror.com/destroy/-/destroy-1.2.0.tgz",
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+      "engines": {
+        "node": ">= 0.8",
+        "npm": "1.2.8000 || >= 1.4.16"
+      }
     },
-    "docsify": {
+    "node_modules/docsify": {
       "version": "4.12.2",
       "resolved": "https://registry.npmmirror.com/docsify/-/docsify-4.12.2.tgz",
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+      "hasInstallScript": true,
+      "dependencies": {
         "dompurify": "^2.3.1",
         "marked": "^1.2.9",
         "medium-zoom": "^1.0.6",
@@ -329,11 +449,11 @@
         "tweezer.js": "^1.4.0"
       }
     },
-    "docsify-cli": {
+    "node_modules/docsify-cli": {
       "version": "4.4.4",
       "resolved": "https://registry.npmmirror.com/docsify-cli/-/docsify-cli-4.4.4.tgz",
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-      "requires": {
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         "chalk": "^2.4.2",
         "connect": "^3.6.0",
         "connect-history-api-fallback": "^1.6.0",
@@ -351,122 +471,159 @@
         "update-notifier": "^4.1.0",
         "yargonaut": "^1.1.2",
         "yargs": "^15.3.0"
+      },
+      "bin": {
+        "docsify": "bin/docsify"
+      },
+      "engines": {
+        "node": ">= 10",
+        "npm": ">= 6"
       }
     },
-    "docsify-server-renderer": {
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-      "requires": {
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         "dompurify": "^2.3.2",
         "node-fetch": "^2.6.6",
         "resolve-pathname": "^3.0.0"
-      },
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+      "resolved": "https://registry.npmmirror.com/debug/-/debug-4.3.4.tgz",
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+        "ms": "2.1.2"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
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         }
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-    "dompurify": {
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+      "resolved": "https://registry.npmmirror.com/ms/-/ms-2.1.2.tgz",
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-    "dot-prop": {
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       "resolved": "https://registry.npmmirror.com/fill-range/-/fill-range-7.0.1.tgz",
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+      "engines": {
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       }
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@@ -474,77 +631,117 @@
         "parseurl": "~1.3.3",
         "statuses": "~1.5.0",
         "unpipe": "~1.0.0"
+      },
+      "engines": {
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       }
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+      "hasInstallScript": true,
+      "optional": true,
+      "os": [
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+      ],
+      "engines": {
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+      "funding": {
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+      "funding": {
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       }
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@@ -556,512 +753,714 @@
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         "to-readable-stream": "^1.0.0",
         "url-parse-lax": "^3.0.0"
+      },
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@@ -1076,171 +1475,229 @@
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       "version": "5.0.0",
       "resolved": "https://registry.npmmirror.com/whatwg-url/-/whatwg-url-5.0.0.tgz",
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-      "requires": {
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         "tr46": "~0.0.3",
         "webidl-conversions": "^3.0.0"
       }
     },
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       "version": "2.0.0",
       "resolved": "https://registry.npmmirror.com/which-module/-/which-module-2.0.0.tgz",
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-    "widest-line": {
+    "node_modules/widest-line": {
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       "resolved": "https://registry.npmmirror.com/widest-line/-/widest-line-3.1.0.tgz",
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         "string-width": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
       }
     },
-    "wrap-ansi": {
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       "version": "6.2.0",
       "resolved": "https://registry.npmmirror.com/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
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         "string-width": "^4.1.0",
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       },
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+      }
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-        }
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmmirror.com/color-convert/-/color-convert-2.0.1.tgz",
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+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
       }
     },
-    "wrappy": {
+    "node_modules/wrap-ansi/node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmmirror.com/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
+    },
+    "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmmirror.com/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ=="
     },
-    "write-file-atomic": {
+    "node_modules/write-file-atomic": {
       "version": "3.0.3",
       "resolved": "https://registry.npmmirror.com/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
       "integrity": "sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==",
-      "requires": {
+      "dependencies": {
         "imurmurhash": "^0.1.4",
         "is-typedarray": "^1.0.0",
         "signal-exit": "^3.0.2",
         "typedarray-to-buffer": "^3.1.5"
       }
     },
-    "ws": {
+    "node_modules/ws": {
       "version": "7.5.8",
       "resolved": "https://registry.npmmirror.com/ws/-/ws-7.5.8.tgz",
-      "integrity": "sha512-ri1Id1WinAX5Jqn9HejiGb8crfRio0Qgu8+MtL36rlTA6RLsMdWt1Az/19A2Qij6uSHUMphEFaTKa4WG+UNHNw=="
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+      "engines": {
+        "node": ">=8.3.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": "^5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
     },
-    "xdg-basedir": {
+    "node_modules/xdg-basedir": {
       "version": "4.0.0",
       "resolved": "https://registry.npmmirror.com/xdg-basedir/-/xdg-basedir-4.0.0.tgz",
-      "integrity": "sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q=="
+      "integrity": "sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q==",
+      "engines": {
+        "node": ">=8"
+      }
     },
-    "y18n": {
+    "node_modules/y18n": {
       "version": "4.0.3",
       "resolved": "https://registry.npmmirror.com/y18n/-/y18n-4.0.3.tgz",
       "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ=="
     },
-    "yallist": {
+    "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmmirror.com/yallist/-/yallist-3.1.1.tgz",
       "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="
     },
-    "yargonaut": {
+    "node_modules/yargonaut": {
       "version": "1.1.4",
       "resolved": "https://registry.npmmirror.com/yargonaut/-/yargonaut-1.1.4.tgz",
       "integrity": "sha512-rHgFmbgXAAzl+1nngqOcwEljqHGG9uUZoPjsdZEs1w5JW9RXYzrSvH/u70C1JE5qFi0qjsdhnUX/dJRpWqitSA==",
-      "requires": {
+      "dependencies": {
         "chalk": "^1.1.1",
         "figlet": "^1.1.1",
         "parent-require": "^1.0.0"
+      }
+    },
+    "node_modules/yargonaut/node_modules/ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmmirror.com/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha512-TIGnTpdo+E3+pCyAluZvtED5p5wCqLdezCyhPZzKPcxvFplEt4i+W7OONCKgeZFT3+y5NZZfOOS/Bdcanm1MYA==",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/yargonaut/node_modules/ansi-styles": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmmirror.com/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha512-kmCevFghRiWM7HB5zTPULl4r9bVFSWjz62MhqizDGUrq2NWuNMQyuv4tHHoKJHs69M/MF64lEcHdYIocrdWQYA==",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/yargonaut/node_modules/chalk": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmmirror.com/chalk/-/chalk-1.1.3.tgz",
+      "integrity": "sha512-U3lRVLMSlsCfjqYPbLyVv11M9CPW4I728d6TCKMAOJueEeB9/8o+eSsMnxPJD+Q+K909sdESg7C+tIkoH6on1A==",
+      "dependencies": {
+        "ansi-styles": "^2.2.1",
+        "escape-string-regexp": "^1.0.2",
+        "has-ansi": "^2.0.0",
+        "strip-ansi": "^3.0.0",
+        "supports-color": "^2.0.0"
       },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/yargonaut/node_modules/strip-ansi": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmmirror.com/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "integrity": "sha512-VhumSSbBqDTP8p2ZLKj40UjBCV4+v8bUSEpUb4KjRgWk9pbqGF4REFj6KEagidb2f/M6AzC0EmFyDNGaw9OCzg==",
       "dependencies": {
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-          "version": "2.1.1",
-          "resolved": "https://registry.npmmirror.com/ansi-regex/-/ansi-regex-2.1.1.tgz",
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-        },
-        "ansi-styles": {
-          "version": "2.2.1",
-          "resolved": "https://registry.npmmirror.com/ansi-styles/-/ansi-styles-2.2.1.tgz",
-          "integrity": "sha512-kmCevFghRiWM7HB5zTPULl4r9bVFSWjz62MhqizDGUrq2NWuNMQyuv4tHHoKJHs69M/MF64lEcHdYIocrdWQYA=="
-        },
-        "chalk": {
-          "version": "1.1.3",
-          "resolved": "https://registry.npmmirror.com/chalk/-/chalk-1.1.3.tgz",
-          "integrity": "sha512-U3lRVLMSlsCfjqYPbLyVv11M9CPW4I728d6TCKMAOJueEeB9/8o+eSsMnxPJD+Q+K909sdESg7C+tIkoH6on1A==",
-          "requires": {
-            "ansi-styles": "^2.2.1",
-            "escape-string-regexp": "^1.0.2",
-            "has-ansi": "^2.0.0",
-            "strip-ansi": "^3.0.0",
-            "supports-color": "^2.0.0"
-          }
-        },
-        "strip-ansi": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmmirror.com/strip-ansi/-/strip-ansi-3.0.1.tgz",
-          "integrity": "sha512-VhumSSbBqDTP8p2ZLKj40UjBCV4+v8bUSEpUb4KjRgWk9pbqGF4REFj6KEagidb2f/M6AzC0EmFyDNGaw9OCzg==",
-          "requires": {
-            "ansi-regex": "^2.0.0"
-          }
-        },
-        "supports-color": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmmirror.com/supports-color/-/supports-color-2.0.0.tgz",
-          "integrity": "sha512-KKNVtd6pCYgPIKU4cp2733HWYCpplQhddZLBUryaAHou723x+FRzQ5Df824Fj+IyyuiQTRoub4SnIFfIcrp70g=="
-        }
+        "ansi-regex": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
       }
     },
-    "yargs": {
+    "node_modules/yargonaut/node_modules/supports-color": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmmirror.com/supports-color/-/supports-color-2.0.0.tgz",
+      "integrity": "sha512-KKNVtd6pCYgPIKU4cp2733HWYCpplQhddZLBUryaAHou723x+FRzQ5Df824Fj+IyyuiQTRoub4SnIFfIcrp70g==",
+      "engines": {
+        "node": ">=0.8.0"
+      }
+    },
+    "node_modules/yargs": {
       "version": "15.4.1",
       "resolved": "https://registry.npmmirror.com/yargs/-/yargs-15.4.1.tgz",
       "integrity": "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==",
-      "requires": {
+      "dependencies": {
         "cliui": "^6.0.0",
         "decamelize": "^1.2.0",
         "find-up": "^4.1.0",
@@ -1473,15 +2002,21 @@
         "which-module": "^2.0.0",
         "y18n": "^4.0.0",
         "yargs-parser": "^18.1.2"
+      },
+      "engines": {
+        "node": ">=8"
       }
     },
-    "yargs-parser": {
+    "node_modules/yargs-parser": {
       "version": "18.1.3",
       "resolved": "https://registry.npmmirror.com/yargs-parser/-/yargs-parser-18.1.3.tgz",
       "integrity": "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==",
-      "requires": {
+      "dependencies": {
         "camelcase": "^5.0.0",
         "decamelize": "^1.2.0"
+      },
+      "engines": {
+        "node": ">=6"
       }
     }
   }
diff --git a/playground.kt b/playground.kt
new file mode 100644
index 0000000000000..4290473b29559
--- /dev/null
+++ b/playground.kt
@@ -0,0 +1,9 @@
+fun main(args: Array<String>) {
+    
+}
+
+class Solution {
+    fun findRepeatNumber(nums: IntArray): Int {
+        
+    }
+}
\ No newline at end of file