+1 by EightSixSun @ 2018-03-21 11:44:15
（没点开讨论）在纸上写写画画了1min，忐忑不安地写了个n/k。（难以置信地点开讨论）卧槽？！a/b problem？还真是？ by DarkValkyrie @ 2019-08-07 11:20:11