In last Codeforces Round 1072 (Div. 3), in problem C : https://codeforces.me/contest/2184/problem/C

My submission in constest time : https://codeforces.me/contest/2184/submission/357537571

After system test, my submission : https://codeforces.me/contest/2184/submission/357713730

2 submitted code are same, but first one got hacked.

how is it possible?