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Hi I have some problem.
I tried this problem https://mirror.codeforces.com/contest/1490/problem/E
https://mirror.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?
Auto comment: topic has been updated by nicotina04 (previous revision, new revision, compare).