Create remove-outermost-parentheses.cpp

Author: kamyu104

C++/remove-outermost-parentheses.cpp

@@ -0,0 +1,20 @@
+// Time:  O(n)
+// Space: O(1)
+
+class Solution {
+public:
+    string removeOuterParentheses(string S) {
+        static const int deep = 1;
+        string result;
+        int cnt = 0;
+        for (const auto& c : S) {
+            if (c == '(' && cnt++ >= deep) {
+                result += c;
+            }
+            if (c == ')' && cnt-- > deep) {
+                result += c;
+            }
+        }
+        return result;
+    }
+};