LeetCode-in-TypeScript · javadev · Apr 12, 2025 · Apr 12, 2025
diff --git a/README.md b/README.md
@@ -393,6 +393,7 @@ TypeScript-based LeetCode algorithm problem solutions, regularly updated.
 
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+| 0242 |[Valid Anagram](src/main/ts/g0201_0300/s0242_valid_anagram/solution.ts)| Easy | String, Hash_Table, Sorting | 4 | 97.99
 
 #### Day 12 Class and Object
 
@@ -884,6 +885,7 @@ TypeScript-based LeetCode algorithm problem solutions, regularly updated.
 | 0020 |[Valid Parentheses](src/main/ts/g0001_0100/s0020_valid_parentheses/solution.ts)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n) | 1 | 86.85
 | 0005 |[Longest Palindromic Substring](src/main/ts/g0001_0100/s0005_longest_palindromic_substring/solution.ts)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) | 8 | 99.14
 | 0394 |[Decode String](src/main/ts/g0301_0400/s0394_decode_string/solution.ts)| Medium | Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n) | 0 | 100.00
+| 0242 |[Valid Anagram](src/main/ts/g0201_0300/s0242_valid_anagram/solution.ts)| Easy | String, Hash_Table, Sorting | 4 | 97.99
 | 0049 |[Group Anagrams](src/main/ts/g0001_0100/s0049_group_anagrams/solution.ts)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n\*k_log_k)_Space_O(n) | 27 | 78.99
 | 0151 |[Reverse Words in a String](src/main/ts/g0101_0200/s0151_reverse_words_in_a_string/solution.ts)| Medium | String, Two_Pointers | 0 | 100.00
 
@@ -1081,12 +1083,15 @@ TypeScript-based LeetCode algorithm problem solutions, regularly updated.
 | 0054 |[Spiral Matrix](src/main/ts/g0001_0100/s0054_spiral_matrix/solution.ts)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Simulation | 0 | 100.00
 | 0048 |[Rotate Image](src/main/ts/g0001_0100/s0048_rotate_image/solution.ts)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1) | 0 | 100.00
 | 0073 |[Set Matrix Zeroes](src/main/ts/g0001_0100/s0073_set_matrix_zeroes/solution.ts)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Big_O_Time_O(m\*n)_Space_O(1) | 4 | 50.63
+| 0289 |[Game of Life](src/main/ts/g0201_0300/s0289_game_of_life/solution.ts)| Medium | Array, Matrix, Simulation | 0 | 100.00
 
 #### Top Interview 150 Hashmap
 
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 | 0205 |[Isomorphic Strings](src/main/ts/g0201_0300/s0205_isomorphic_strings/solution.ts)| Easy | String, Hash_Table | 3 | 96.02
+| 0290 |[Word Pattern](src/main/ts/g0201_0300/s0290_word_pattern/solution.ts)| Easy | String, Hash_Table | 0 | 100.00
+| 0242 |[Valid Anagram](src/main/ts/g0201_0300/s0242_valid_anagram/solution.ts)| Easy | String, Hash_Table, Sorting | 4 | 97.99
 | 0049 |[Group Anagrams](src/main/ts/g0001_0100/s0049_group_anagrams/solution.ts)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n\*k_log_k)_Space_O(n) | 27 | 78.99
 | 0001 |[Two Sum](src/main/ts/g0001_0100/s0001_two_sum/solution.ts)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task | 1 | 89.70
 | 0202 |[Happy Number](src/main/ts/g0201_0300/s0202_happy_number/solution.ts)| Easy | Top_Interview_Questions, Hash_Table, Math, Two_Pointers | 0 | 100.00
@@ -1097,6 +1102,7 @@ TypeScript-based LeetCode algorithm problem solutions, regularly updated.
 
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+| 0228 |[Summary Ranges](src/main/ts/g0201_0300/s0228_summary_ranges/solution.ts)| Easy | Array | 0 | 100.00
 | 0056 |[Merge Intervals](src/main/ts/g0001_0100/s0056_merge_intervals/solution.ts)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) | 7 | 87.99
 | 0057 |[Insert Interval](src/main/ts/g0001_0100/s0057_insert_interval/solution.ts)| Medium | Array | 0 | 100.00
 
@@ -1108,6 +1114,7 @@ TypeScript-based LeetCode algorithm problem solutions, regularly updated.
 | 0071 |[Simplify Path](src/main/ts/g0001_0100/s0071_simplify_path/solution.ts)| Medium | String, Stack | 0 | 100.00
 | 0155 |[Min Stack](src/main/ts/g0101_0200/s0155_min_stack/solution.ts)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N) | 5 | 99.10
 | 0150 |[Evaluate Reverse Polish Notation](src/main/ts/g0101_0200/s0150_evaluate_reverse_polish_notation/solution.ts)| Medium | Top_Interview_Questions, Array, Math, Stack | 1 | 97.48
+| 0224 |[Basic Calculator](src/main/ts/g0201_0300/s0224_basic_calculator/solution.ts)| Hard | String, Math, Stack, Recursion | 6 | 96.62
 
 #### Top Interview 150 Linked List
 
@@ -1178,7 +1185,7 @@ TypeScript-based LeetCode algorithm problem solutions, regularly updated.
 |-|-|-|-|-|-
 | 0208 |[Implement Trie (Prefix Tree)](src/main/ts/g0201_0300/s0208_implement_trie_prefix_tree/solution.ts)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N) | 48 | 63.95
 | 0211 |[Design Add and Search Words Data Structure](src/main/ts/g0201_0300/s0211_design_add_and_search_words_data_structure/solution.ts)| Medium | String, Depth_First_Search, Design, Trie | 450 | 92.88
-| 0212 |[Word Search II](src/main/ts/g0201_0300/s0212_word_search_ii/solution.ts)| Hard | Top_Interview_Questions, Array, String, Matrix, Backtracking, Trie | ew 150 | ew 150 Trie
+| 0212 |[Word Search II](src/main/ts/g0201_0300/s0212_word_search_ii/solution.ts)| Hard | Top_Interview_Questions, Array, String, Matrix, Backtracking, Trie | 62 | 99.46
 
 #### Top Interview 150 Backtracking
 
@@ -1308,6 +1315,7 @@ TypeScript-based LeetCode algorithm problem solutions, regularly updated.
 
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+| 0242 |[Valid Anagram](src/main/ts/g0201_0300/s0242_valid_anagram/solution.ts)| Easy | String, Hash_Table, Sorting | 4 | 97.99
 
 #### Day 7 Linked List
 
@@ -1405,6 +1413,7 @@ TypeScript-based LeetCode algorithm problem solutions, regularly updated.
 
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+| 0290 |[Word Pattern](src/main/ts/g0201_0300/s0290_word_pattern/solution.ts)| Easy | String, Hash_Table | 0 | 100.00
 | 0763 |[Partition Labels](src/main/ts/g0701_0800/s0763_partition_labels/solution.ts)| Medium | String, Hash_Table, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1) | 4 | 86.89
 
 #### Day 8 String
@@ -1739,20 +1748,25 @@ TypeScript-based LeetCode algorithm problem solutions, regularly updated.
 | 0322 |[Coin Change](src/main/ts/g0301_0400/s0322_coin_change/solution.ts)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_20, Level_2_Day_12_Dynamic_Programming, Top_Interview_150_1D_DP, Big_O_Time_O(m\*n)_Space_O(amount) | 27 | 89.42
 | 0300 |[Longest Increasing Subsequence](src/main/ts/g0201_0300/s0300_longest_increasing_subsequence/solution.ts)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Algorithm_II_Day_16_Dynamic_Programming, Binary_Search_II_Day_3, Dynamic_Programming_I_Day_18, Udemy_Dynamic_Programming, Top_Interview_150_1D_DP, Big_O_Time_O(n\*log_n)_Space_O(n) | 6 | 84.68
 | 0295 |[Find Median from Data Stream](src/main/ts/g0201_0300/s0295_find_median_from_data_stream/solution.ts)| Hard | Top_100_Liked_Questions, Sorting, Two_Pointers, Design, Heap_Priority_Queue, Data_Stream, Top_Interview_150_Heap, Big_O_Time_O(n\*log_n)_Space_O(n) | 106 | 92.31
+| 0290 |[Word Pattern](src/main/ts/g0201_0300/s0290_word_pattern/solution.ts)| Easy | String, Hash_Table, Data_Structure_II_Day_7_String, Top_Interview_150_Hashmap | 0 | 100.00
+| 0289 |[Game of Life](src/main/ts/g0201_0300/s0289_game_of_life/solution.ts)| Medium | Array, Matrix, Simulation, Top_Interview_150_Matrix | 0 | 100.00
 | 0287 |[Find the Duplicate Number](src/main/ts/g0201_0300/s0287_find_the_duplicate_number/solution.ts)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Binary_Search_II_Day_5, Big_O_Time_O(n)_Space_O(n) | 5 | 88.65
 | 0283 |[Move Zeroes](src/main/ts/g0201_0300/s0283_move_zeroes/solution.ts)| Easy | Top_100_Liked_Questions, Array, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Programming_Skills_I_Day_6_Array, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1) | 1 | 82.86
+| 0242 |[Valid Anagram](src/main/ts/g0201_0300/s0242_valid_anagram/solution.ts)| Easy | String, Hash_Table, Sorting, Data_Structure_I_Day_6_String, Programming_Skills_I_Day_11_Containers_and_Libraries, Udemy_Strings, Top_Interview_150_Hashmap | 4 | 97.99
 | 0240 |[Search a 2D Matrix II](src/main/ts/g0201_0300/s0240_search_a_2d_matrix_ii/solution.ts)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Data_Structure_II_Day_4_Array, Binary_Search_II_Day_8, Big_O_Time_O(n+m)_Space_O(1) | 42 | 94.61
 | 0239 |[Sliding Window Maximum](src/main/ts/g0201_0300/s0239_sliding_window_maximum/solution.ts)| Hard | Top_100_Liked_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Udemy_Arrays, Big_O_Time_O(n\*k)_Space_O(n+k) | 26 | 99.07
 | 0238 |[Product of Array Except Self](src/main/ts/g0201_0300/s0238_product_of_array_except_self/solution.ts)| Medium | Top_100_Liked_Questions, Array, Prefix_Sum, Data_Structure_II_Day_5_Array, Udemy_Arrays, Top_Interview_150_Array/String, Big_O_Time_O(n^2)_Space_O(n) | 3 | 92.81
 | 0236 |[Lowest Common Ancestor of a Binary Tree](src/main/ts/g0201_0300/s0236_lowest_common_ancestor_of_a_binary_tree/solution.ts)| Medium | Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue, Top_Interview_150_Binary_Tree_General, Big_O_Time_O(n)_Space_O(n) | 61 | 75.97
 | 0234 |[Palindrome Linked List](src/main/ts/g0201_0300/s0234_palindrome_linked_list/solution.ts)| Easy | Top_100_Liked_Questions, Two_Pointers, Stack, Linked_List, Recursion, Level_2_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(1) | 3 | 92.85
 | 0230 |[Kth Smallest Element in a BST](src/main/ts/g0201_0300/s0230_kth_smallest_element_in_a_bst/solution.ts)| Medium | Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_17_Tree, Level_2_Day_9_Binary_Search_Tree, Top_Interview_150_Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n) | 0 | 100.00
+| 0228 |[Summary Ranges](src/main/ts/g0201_0300/s0228_summary_ranges/solution.ts)| Easy | Array, Top_Interview_150_Intervals | 0 | 100.00
 | 0226 |[Invert Binary Tree](src/main/ts/g0201_0300/s0226_invert_binary_tree/solution.ts)| Easy | Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree, Level_2_Day_6_Tree, Udemy_Tree_Stack_Queue, Top_Interview_150_Binary_Tree_General, Big_O_Time_O(n)_Space_O(n) | 0 | 100.00
+| 0224 |[Basic Calculator](src/main/ts/g0201_0300/s0224_basic_calculator/solution.ts)| Hard | String, Math, Stack, Recursion, Top_Interview_150_Stack | 6 | 96.62
 | 0222 |[Count Complete Tree Nodes](src/main/ts/g0201_0300/s0222_count_complete_tree_nodes/solution.ts)| Easy | Depth_First_Search, Tree, Binary_Search, Binary_Tree, Binary_Search_II_Day_10, Top_Interview_150_Binary_Tree_General | 0 | 100.00
 | 0221 |[Maximal Square](src/main/ts/g0201_0300/s0221_maximal_square/solution.ts)| Medium | Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Top_Interview_150_Multidimensional_DP, Big_O_Time_O(m\*n)_Space_O(m\*n) | 18 | 59.02
 | 0219 |[Contains Duplicate II](src/main/ts/g0201_0300/s0219_contains_duplicate_ii/solution.ts)| Easy | Array, Hash_Table, Sliding_Window, Top_Interview_150_Hashmap | 17 | 79.29
 | 0215 |[Kth Largest Element in an Array](src/main/ts/g0201_0300/s0215_kth_largest_element_in_an_array/solution.ts)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Data_Structure_II_Day_20_Heap_Priority_Queue, Top_Interview_150_Heap, Big_O_Time_O(n\*log(n))_Space_O(log(n)) | 4 | 99.64
-| 0212 |[Word Search II](src/main/ts/g0201_0300/s0212_word_search_ii/solution.ts)| Hard | Top_Interview_Questions, Array, String, Matrix, Backtracking, Trie | ew 150 | ew 150 Trie
+| 0212 |[Word Search II](src/main/ts/g0201_0300/s0212_word_search_ii/solution.ts)| Hard | Top_Interview_Questions, Array, String, Matrix, Backtracking, Trie, Top_Interview_150_Trie | 62 | 99.46
 | 0211 |[Design Add and Search Words Data Structure](src/main/ts/g0201_0300/s0211_design_add_and_search_words_data_structure/solution.ts)| Medium | String, Depth_First_Search, Design, Trie, Top_Interview_150_Trie | 450 | 92.88
 | 0210 |[Course Schedule II](src/main/ts/g0201_0300/s0210_course_schedule_ii/solution.ts)| Medium | Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Level_2_Day_11_Graph/BFS/DFS, Top_Interview_150_Graph_General | 2 | 99.76
 | 0209 |[Minimum Size Subarray Sum](src/main/ts/g0201_0300/s0209_minimum_size_subarray_sum/solution.ts)| Medium | Array, Binary_Search, Prefix_Sum, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Binary_Search_II_Day_1, Top_Interview_150_Sliding_Window | 2 | 88.11

diff --git a/src/main/ts/g0201_0300/s0224_basic_calculator/readme.md b/src/main/ts/g0201_0300/s0224_basic_calculator/readme.md
@@ -0,0 +1,35 @@
+224\. Basic Calculator
+
+Hard
+
+Given a string `s` representing a valid expression, implement a basic calculator to evaluate it, and return _the result of the evaluation_.
+
+**Note:** You are **not** allowed to use any built-in function which evaluates strings as mathematical expressions, such as `eval()`.
+
+**Example 1:**
+
+**Input:** s = "1 + 1"
+
+**Output:** 2 
+
+**Example 2:**
+
+**Input:** s = " 2-1 + 2 "
+
+**Output:** 3 
+
+**Example 3:**
+
+**Input:** s = "(1+(4+5+2)-3)+(6+8)"
+
+**Output:** 23 
+
+**Constraints:**
+
+*   <code>1 <= s.length <= 3 * 10<sup>5</sup></code>
+*   `s` consists of digits, `'+'`, `'-'`, `'('`, `')'`, and `' '`.
+*   `s` represents a valid expression.
+*   `'+'` is **not** used as a unary operation (i.e., `"+1"` and `"+(2 + 3)"` is invalid).
+*   `'-'` could be used as a unary operation (i.e., `"-1"` and `"-(2 + 3)"` is valid).
+*   There will be no two consecutive operators in the input.
+*   Every number and running calculation will fit in a signed 32-bit integer.
diff --git a/src/main/ts/g0201_0300/s0224_basic_calculator/solution.ts b/src/main/ts/g0201_0300/s0224_basic_calculator/solution.ts
@@ -0,0 +1,39 @@
+// #Hard #String #Math #Stack #Recursion #Top_Interview_150_Stack
+// #2025_04_12_Time_6_ms_(96.62%)_Space_57.57_MB_(89.85%)
+
+function calculate(s: string): number {
+    let i = 0
+
+    function helper(ca: string[]): number {
+        let num = 0
+        let prenum = 0
+        let isPlus = true
+        while (i < ca.length) {
+            const c = ca[i]
+            if (c !== ' ') {
+                if (c >= '0' && c <= '9') {
+                    num = num * 10 + parseInt(c)
+                } else if (c === '+') {
+                    prenum += num * (isPlus ? 1 : -1)
+                    isPlus = true
+                    num = 0
+                } else if (c === '-') {
+                    prenum += num * (isPlus ? 1 : -1)
+                    isPlus = false
+                    num = 0
+                } else if (c === '(') {
+                    i++
+                    num = helper(ca)
+                } else if (c === ')') {
+                    prenum += num * (isPlus ? 1 : -1)
+                    return prenum
+                }
+            }
+            i++
+        }
+        return prenum + num * (isPlus ? 1 : -1)
+    }
+    return helper(s.split(''))
+}
+
+export { calculate }
diff --git a/src/main/ts/g0201_0300/s0228_summary_ranges/readme.md b/src/main/ts/g0201_0300/s0228_summary_ranges/readme.md
@@ -0,0 +1,53 @@
+228\. Summary Ranges
+
+Easy
+
+You are given a **sorted unique** integer array `nums`.
+
+Return _the **smallest sorted** list of ranges that **cover all the numbers in the array exactly**_. That is, each element of `nums` is covered by exactly one of the ranges, and there is no integer `x` such that `x` is in one of the ranges but not in `nums`.
+
+Each range `[a,b]` in the list should be output as:
+
+*   `"a->b"` if `a != b`
+*   `"a"` if `a == b`
+
+**Example 1:**
+
+**Input:** nums = [0,1,2,4,5,7]
+
+**Output:** ["0->2","4->5","7"]
+
+**Explanation:** The ranges are: [0,2] --> "0->2" [4,5] --> "4->5" [7,7] --> "7" 
+
+**Example 2:**
+
+**Input:** nums = [0,2,3,4,6,8,9]
+
+**Output:** ["0","2->4","6","8->9"]
+
+**Explanation:** The ranges are: [0,0] --> "0" [2,4] --> "2->4" [6,6] --> "6" [8,9] --> "8->9" 
+
+**Example 3:**
+
+**Input:** nums = []
+
+**Output:** [] 
+
+**Example 4:**
+
+**Input:** nums = [-1]
+
+**Output:** ["-1"] 
+
+**Example 5:**
+
+**Input:** nums = [0]
+
+**Output:** ["0"] 
+
+**Constraints:**
+
+*   `0 <= nums.length <= 20`
+*   <code>-2<sup>31</sup> <= nums[i] <= 2<sup>31</sup> - 1</code>
+*   All the values of `nums` are **unique**.
+*   `nums` is sorted in ascending order.
diff --git a/src/main/ts/g0201_0300/s0228_summary_ranges/solution.ts b/src/main/ts/g0201_0300/s0228_summary_ranges/solution.ts
@@ -0,0 +1,34 @@
+// #Easy #Array #Top_Interview_150_Intervals #2025_04_12_Time_0_ms_(100.00%)_Space_55.25_MB_(57.62%)
+
+function summaryRanges(nums: number[]): string[] {
+    const ranges: string[] = []
+    const n = nums.length
+    if (n === 0) {
+        return ranges
+    }
+    let a = nums[0]
+    let b = a
+    let strB = ''
+    for (let i = 1; i < n; i++) {
+        if (nums[i] !== b + 1) {
+            strB = a.toString()
+            if (a !== b) {
+                strB += '->' + b.toString()
+            }
+            ranges.push(strB)
+            a = nums[i]
+            b = a
+            strB = ''
+        } else {
+            b++
+        }
+    }
+    strB = a.toString()
+    if (a !== b) {
+        strB += '->' + b.toString()
+    }
+    ranges.push(strB)
+    return ranges
+}
+
+export { summaryRanges }
diff --git a/src/main/ts/g0201_0300/s0242_valid_anagram/readme.md b/src/main/ts/g0201_0300/s0242_valid_anagram/readme.md
@@ -0,0 +1,24 @@
+242\. Valid Anagram
+
+Easy
+
+Given two strings `s` and `t`, return `true` _if_ `t` _is an anagram of_ `s`_, and_ `false` _otherwise_.
+
+**Example 1:**
+
+**Input:** s = "anagram", t = "nagaram"
+
+**Output:** true 
+
+**Example 2:**
+
+**Input:** s = "rat", t = "car"
+
+**Output:** false 
+
+**Constraints:**
+
+*   <code>1 <= s.length, t.length <= 5 * 10<sup>4</sup></code>
+*   `s` and `t` consist of lowercase English letters.
+
+**Follow up:** What if the inputs contain Unicode characters? How would you adapt your solution to such a case?
diff --git a/src/main/ts/g0201_0300/s0242_valid_anagram/solution.ts b/src/main/ts/g0201_0300/s0242_valid_anagram/solution.ts
@@ -0,0 +1,17 @@
+// #Easy #String #Hash_Table #Sorting #Data_Structure_I_Day_6_String
+// #Programming_Skills_I_Day_11_Containers_and_Libraries #Udemy_Strings #Top_Interview_150_Hashmap
+// #2025_04_12_Time_4_ms_(97.99%)_Space_57.08_MB_(80.13%)
+
+function isAnagram(s: string, t: string): boolean {
+    if (s.length !== t.length) {
+        return false
+    }
+    let counts = new Array(26).fill(0)
+    for (let i = 0; i < s.length; ++i) {
+        counts[s.charCodeAt(i) - 'a'.charCodeAt(0)]++
+        counts[t.charCodeAt(i) - 'a'.charCodeAt(0)]--
+    }
+    return counts.every((c) => c === 0)
+}
+
+export { isAnagram }