All about problems in Volume 16. If there is a thread about your problem, please use it. If not, create one with its number in the subject.
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Hi,admins, is data case of this problem correct? My code has been accepted in codeforces gym(345 testcases) but WA 0ms, seems it is not normal wa...(hope admin not throwout test data because offical test data has already became a lot of loopholes)