From 0a13bff07bfed219552709dd7ff59bb9d2fcd045 Mon Sep 17 00:00:00 2001
From: Sainnhe Park <i@sainnhe.dev>
Date: Mon, 21 Nov 2022 16:51:23 +0800
Subject: [PATCH] s0032

---
 include/s0032_longest_valid_parentheses.hpp | 15 ++++++++++
 src/s0032_longest_valid_parentheses.cpp     | 18 ++++++++++++
 tests/s0032_longest_valid_parentheses.cpp   | 31 +++++++++++++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 include/s0032_longest_valid_parentheses.hpp
 create mode 100644 src/s0032_longest_valid_parentheses.cpp
 create mode 100644 tests/s0032_longest_valid_parentheses.cpp

diff --git a/include/s0032_longest_valid_parentheses.hpp b/include/s0032_longest_valid_parentheses.hpp
new file mode 100644
index 0000000..8aef8f7
--- /dev/null
+++ b/include/s0032_longest_valid_parentheses.hpp
@@ -0,0 +1,15 @@
+#ifndef S0032_LONGEST_VALID_PARENTHESES
+#define S0032_LONGEST_VALID_PARENTHESES
+
+#include <string>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+class Solution {
+ public:
+  int longestValidParentheses(string s);
+};
+
+#endif
diff --git a/src/s0032_longest_valid_parentheses.cpp b/src/s0032_longest_valid_parentheses.cpp
new file mode 100644
index 0000000..c146389
--- /dev/null
+++ b/src/s0032_longest_valid_parentheses.cpp
@@ -0,0 +1,18 @@
+#include "s0032_longest_valid_parentheses.hpp"
+
+int Solution::longestValidParentheses(string s) {
+  int maxans = 0, n = s.length();
+  vector<int> dp(n, 0);
+  for (int i = 1; i < n; i++) {
+    if (s[i] == ')') {
+      if (s[i - 1] == '(') {
+        dp[i] = (i >= 2 ? dp[i - 2] : 0) + 2;
+      } else if (i - dp[i - 1] > 0 && s[i - dp[i - 1] - 1] == '(') {
+        dp[i] =
+            dp[i - 1] + ((i - dp[i - 1]) >= 2 ? dp[i - dp[i - 1] - 2] : 0) + 2;
+      }
+      maxans = max(maxans, dp[i]);
+    }
+  }
+  return maxans;
+}
diff --git a/tests/s0032_longest_valid_parentheses.cpp b/tests/s0032_longest_valid_parentheses.cpp
new file mode 100644
index 0000000..49ee0b6
--- /dev/null
+++ b/tests/s0032_longest_valid_parentheses.cpp
@@ -0,0 +1,31 @@
+#include "s0032_longest_valid_parentheses.hpp"
+
+#include <gtest/gtest.h>
+
+TEST(Problem32, Case1) {
+  string i{"(()"};
+  int o{2};
+  Solution solution;
+  EXPECT_EQ(solution.longestValidParentheses(i), o);
+}
+
+TEST(Problem32, Case2) {
+  string i{")()())"};
+  int o{4};
+  Solution solution;
+  EXPECT_EQ(solution.longestValidParentheses(i), o);
+}
+
+TEST(Problem32, Case3) {
+  string i{"())"};
+  int o{2};
+  Solution solution;
+  EXPECT_EQ(solution.longestValidParentheses(i), o);
+}
+
+TEST(Problem32, Case4) {
+  string i{"()(()"};
+  int o{2};
+  Solution solution;
+  EXPECT_EQ(solution.longestValidParentheses(i), o);
+}