Initial commit

Easy/valid-parentheses/solution.cpp

@@ -0,0 +1,24 @@
+#include <iostream>
+#include <stack>
+
+class Solution {
+  public:
+    bool isValid(std::string line) {
+        std::stack<char> shelf;
+        for (auto iter = line.begin(); iter != line.end(); iter.operator++()) {
+            if (*iter == '(' || *iter == '{' || *iter == '[') {
+                shelf.push(*iter);
+            } else if (shelf.empty()) {
+                return false;
+            } else if ((*iter == ')' && shelf.top() == '(') ||
+                       (*iter == '}' && shelf.top() == '{') ||
+                       (*iter == ']' && shelf.top() == '[')) {
+                shelf.pop();
+            } else {
+                return false;
+            }
+        }
+
+        return shelf.empty();
+    }
+};