2022 ICPC Seoul Regional will open a mirror contest.

See below the link for more information.

http://icpckorea.org/archives/2741

Hi I have some problem.

I tried this problem https://codeforces.com/contest/1490/problem/E

https://codeforces.com/contest/1490/submission/142727970

It worked well in custom invocation, but when I submit it, I got a WA.

I want to know why this happened. Is it a technical problem?