Update and rename 344. Reverse String to 344. Reverse String.cpp

Author: SjxSubham

344. Reverse String

@@ -0,0 +1,19 @@
+  // using vector
+class Solution {
+public:
+    void reverseString(vector<char>& s) {
+        reverse(s.begin(),s.end());
+    }
+};
+
+// using iteration
+class Solution {
+public:
+    void reverseString(vector<char>& s) {
+        int l=0;
+        int r = s.size()-1;
+        while(l<=r){
+            swap(s[l++],s[r--]);
+        }
+    }
+};