Why this submission get WA? the submissionhttp://codeforces.me/contest/986/submission/38775795 I run it on the CUSTOM INVOCATION with the WA data,and the result is right. Can you tell me the bug?Or codeforces has bug.
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Yes.
While its true that on custom invocation you get 10 (which you should), I ran it on another online compiler and it gives 11. Seems like there's some kind of undefined behavior in your code.