I have been trying to submit my code for https://codeforces.com/contest/281/problem/B , and my code works prefectly fine on personal pc, hackerearth and codechef compilers, but fails on test 1 in codeforces. I used GNU C++14 on codeforces. Can anyone please explain what I am supposed to change to get it to work in codeforces compiler.

my codeforces submision:- https://codeforces.com/contest/281/submission/55179537