32 longest valid parentheses

PARTICIPANTS.md

@@ -142,3 +142,15 @@
 - 🔭 Connect with me: **[Piyushjar](https://github.com/piyushjar))**
 
 ---
+
+---
+### Connect with me:
+
+<img align="right" src="https://avatars.githubusercontent.com/u/45764005?v=4" width="100px;" alt=""/>
+
+- 👨‍💻 My name is **Vinayak Jaiswal**
+- 🌱 I’m a FullStack Developer.
+- 📫 Reach me: **[email protected]**
+- 🔭 Connect with me: **[Vinayakjaiswal07](https://github.com/Vinayakjaiswal07)**
+
+---

python/32-Longest-Valid-Parentheses.py

@@ -0,0 +1,15 @@
+class Solution:
+    def longestValidParentheses(self, A: str) -> int:
+        s=[-1]
+        m=0
+        for i in range(len(A)):
+            if A[i]=='(':
+                s.append(i)
+
+            else:
+                s.pop()
+                if not s:
+                    s.append(i)
+                else:
+                    m=max(m,i-s[-1])
+        return m