InterviewBit Problems   Longest valid Parentheses : Unsolved

About the Longest valid Parentheses : Unsolved category (1)
O(n) solution checkout (2)
Can anyone please explain why this code is wrong (1)
I'm stuckling a test case (8)
Test cases are weak! (1)
Wrong expected result (2)
Memory Limit exceeding error (2)
Seg fault Python 3 (4)
Solution for Submission wrong but test as custom input correct (1)
This problem should be in stack section (2)
Giving different output when submitting (7)
Not a DP problem (1)
Getting Segmentation fault even after Correct Answer. Does this mean that memory (2)
This is not a DP problem. There are no overlapping sub problems or optimal substructure (3)
Are parentheses within parentheses allowed? (2)
When I press test or submit button, it says waiting to run and hangs there with n (1)
Hi, The Solution answer to this problem is not being accepted. I had written my c (4)