http://mirror.codeforces.com/problemset/problem/518/B

I wrote two naive solutions that should have both resulted in TLE. But one is showing wrong answer.

The only difference in both the solutions is that in Sol A, I mark the character to be removed as '0' whereas in the next one I actually remove the character from the string. But the solution in which I remove

the character is showing wrong answer instead of TLE. Could andybody explain what caused the judge to produce different decisions?

Solution A : TLE http://mirror.codeforces.com/contest/518/submission/11545724

Solution B: Wrong Answer http://mirror.codeforces.com/contest/518/submission/11545764