5 problems solved.

lintcoder · lintcoder · commit a878ba95892e · 2021-01-10T21:24:19.000+08:00
diff --git a/src/1507.cpp b/src/1507.cpp
@@ -0,0 +1,15 @@
+string reformatDate(string date) {
+        map<string, string> mp{{"Jan","01"},{"Feb","02"},{"Mar","03"},{"Apr","04"},
+                               {"May","05"},{"Jun","06"},{"Jul","07"},{"Aug","08"},
+                               {"Sep","09"},{"Oct","10"},{"Nov","11"},{"Dec","12"}};
+        int index = date.find(' ');
+        stringstream ss;
+        ss << *(date.rbegin()+3) << *(date.rbegin()+2) << *(date.rbegin()+1) << *date.rbegin() << '-';
+        string month = mp[date.substr(index+1, 3)];
+        ss << month << '-';
+        if (index == 3)
+            ss <<'0';
+        ss << date.substr(0, index-2);
+        
+        return ss.str();
+    }
diff --git a/src/1598.cpp b/src/1598.cpp
@@ -0,0 +1,18 @@
+int minOperations(vector<string>& logs) {
+        int len = logs.size();
+        int depth = 0;
+        for (int i = 0; i < len; ++i)
+        {
+            if (logs[i] == "../")
+            {
+                if (depth > 0)
+                    --depth;
+            }
+            else if (logs[i] == "./")
+                ;
+            else
+                ++depth;
+        }
+        
+        return depth;
+    }
diff --git a/src/1619.cpp b/src/1619.cpp
@@ -0,0 +1,12 @@
+double trimMean(vector<int>& arr) {
+        sort(arr.begin(), arr.end());
+        int len = arr.size();
+        int k = len*0.05;
+        double mean = 0;
+        for (int i = k; i < len-k; ++i)
+        {
+            mean += arr[i];
+        }
+        
+        return mean/(len-2*k);
+    }
diff --git a/src/1636.cpp b/src/1636.cpp
@@ -0,0 +1,12 @@
+vector<int> frequencySort(vector<int>& nums) {
+        map<int, int> mp;
+        for (auto v : nums)
+            mp[v]++;
+
+        auto cmp = [&mp](int a, int b) {
+            return mp[a] < mp[b] || (mp[a] == mp[b] && a > b);
+        };
+        sort(nums.begin(), nums.end(), cmp);
+        
+        return nums;
+    }
diff --git a/src/1720.cpp b/src/1720.cpp
@@ -0,0 +1,11 @@
+vector<int> decode(vector<int>& encoded, int first) {
+        int len = encoded.size();
+        vector<int> res(len+1, 0);
+        res[0] = first;
+        for (int i = 0; i < len; ++i)
+        {
+            res[i+1] = encoded[i]^res[i];
+        }
+        
+        return res;
+    }
