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I stucked in this question for long now I tried in almost all possible cases but still it kept showing wrong answer on test#2 please help, whats wrong in my code or you can give some strong test cases.
https://mirror.codeforces.com/contest/1400/submission/91015416
So the condiiton you are missing is this-
While operating for characters i=0 to i=(x-1), u directly set the character in string w as s[i] if (i+x)<n, what if (i+x)>=n, and the string s has a '1' at position i. In that case, you need to print (-1) as the answer.
Similarly for i =(n-x) to (n-1).
Hope you get it :)
Link to your AC submission