Educational Codeforces Round 87 (Rated for Div. 2)日常训练
A.AlarmClocktimelimitpertest2secondsmemorylimitpertest256megabytesinputstandardinputoutputstandardoutputPolycarphasspenttheentiredaypreparingproblemsforyou.Nowhehastosleepforatleastaminutestofeelrefre