Ren Baoshuo d9ff28991c C - Chat Ban ... https://codeforces.com/contest/1612/submission/136476673		2021-11-22 19:38:28 +08:00
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A	A - Distance	2021-11-22 17:59:22 +08:00
B	B - Special Permutation	2021-11-22 18:30:42 +08:00
C	C - Chat Ban	2021-11-22 19:38:28 +08:00