Can someone explain why is this code, https://codeforces.com/problemset/submission/1/115772376, facing run time error? Is there any bug in the code?

Hey everyone! I am getting "Time limit exceeded" prompt on a fairly easy question. Here's my code: https://codeforces.com/problemset/submission/1520/115570147. Can somebody point out why is my code exceeding the time limit with suitable corrections? Thanks in advance!