diff --git a/C++/longest_valid_parenthesis.cpp b/C++/longest_valid_parenthesis.cpp
new file mode 100644
index 0000000..00398ae
--- /dev/null
+++ b/C++/longest_valid_parenthesis.cpp
@@ -0,0 +1,35 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Solution {
+public:
+    int longestValidParentheses(string s) {
+        stack<int> st;
+        int result = 0, previous = -1;
+        
+        for (int i = 0; i < s.size(); i++) {
+            
+           if (s[i] == '(') st.push(i);
+            
+            else {
+                if (!st.empty()) {
+                    st.pop();
+                    if (st.empty()) result = max(result, i - previous);
+                    else result = max(result, i - st.top()); 
+                }
+                else previous = i;
+            }
+        }
+        
+        return result;
+    }
+        
+    
+};
+
+
+int main() {
+    Solution s;
+    cout<<s.longestValidParentheses("(())()(()")<<endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/C++/longest_valid_parenthesis.exe b/C++/longest_valid_parenthesis.exe
new file mode 100644
index 0000000..75ffd75
Binary files /dev/null and b/C++/longest_valid_parenthesis.exe differ