From d8f3b40085619cb680c8f227c65a1f5acc393223 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 23 Feb 2021 21:07:19 +0800
Subject: Move leetcode solutions to subdir.

---
 leetcode/cpp/22.cpp | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 leetcode/cpp/22.cpp

(limited to 'leetcode/cpp/22.cpp')

diff --git a/leetcode/cpp/22.cpp b/leetcode/cpp/22.cpp
new file mode 100644
index 0000000..e9467f1
--- /dev/null
+++ b/leetcode/cpp/22.cpp
@@ -0,0 +1,40 @@
+#include <string>
+#include <vector>
+
+using std::string;
+using std::vector;
+
+class Solution
+{
+public:
+    static void backtrack(vector<string> &result, string &current, int left, int right, int count, int string_length)
+    {
+        if (current.length() == string_length)
+        {
+            result.push_back(current);
+            return;
+        }
+
+        if (left < count)
+        {
+            current.push_back('(');
+            backtrack(result, current, left + 1, right, count, string_length);
+            current.pop_back();
+        }
+
+        if (right < left)
+        {
+            current.push_back(')');
+            backtrack(result, current, left, right + 1, count, string_length);
+            current.pop_back();
+        }
+    }
+
+    vector<string> generateParenthesis(int n)
+    {
+        vector<string> result;
+        string current;
+        backtrack(result, current, 0, 0, n, n * 2);
+        return std::move(result);
+    }
+};
\ No newline at end of file
-- 
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