Someone Pls help me debug this DSA week 2 MATCHED BRACKETS

CodeChef-DSA-learners
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1

https://www.codechef.com/viewsolution/32186468
please help me find my mistake unable to find. Thanks in advance.

2

Consider the test input:

8
1 1 1 2 1 2 2 2
2 Likes
3

Thanks, buddy Actually I am new to competitive .
Can you help me with this as well CodeChef: Practical coding for everyone
what should be the approach to deal with an expression like (D/E^F) where proper brackets are not present ?

4

Also help me with this–> I have almost finished Beginners section and I am comfortable with them. Now I want to know whether I should go for the same order(easy section now). Or there is some other better platform to practice. In beginners, I think I was not learning any new DS or Algo just practicing maths problems. please guide !!!