InterviewBit Problems   Stacks : Unsolved

About the Stacks : Unsolved category (1)
Showing Partial correct in O(n) (1)
Can anyone help me to find out what's wrong with my code please? (2)
Examples of unbalanced string contains balanced one (1)
Don't know why it's not working (1)
Can anybody please suggest where I am wrong? (2)
Getting Wrong Answer for the below question (1)
Where am I going wrong (2)
Custom Tests Issue (1)