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WorldQuant Round 1 (Codeforces Round 1128, Div. 1 + Div. 2)
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Codeforces (c) Copyright 2010-2026 Михаил Мирзаянов
Соревнования по программированию 2.0
Время на сервере: 14.10.2026 21:31:38 (g2).
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I heard rumors about the interactor acting up in this problem, and your output seems coherent here. So I guess it's not your fault.
I also spent an hour yesterday failing on test 1 despite my code working fine testing locally, only to learn that it was registering an extra "\n" as the line where I choose to be Alice or Bob in test case 2 (after like 20 testing submissions), so the interactor definitely had some issues.
I can't believe a same code which can pass the pretest WA on pretest again. Did you use anything random？
In fact, I don't. You can use the Compare button to find that the two codes are identical, so I'm confused.
me too
Your
rd()function seems to contain undefined behavior when used withcinSee 273354445 and 273354530
Yeah, I agree. Specifically, the code is mixing C I/O (
getchar()) and C++ I/O (cin) after it callsios::sync_with_stdio(false), which breaks buffering and results implementation-defined behavior (cppreference).Well, I think you're right. Thanks.