StarKnight @ 2019-08-04 14:19:52
Rt,非本人所写，但个人感觉有帮助(T1tree)
by disangan233 @ 2019-08-04 14:31:34
@AC之心 Orz您切爆noip史上第3难题
by ShineEternal @ 2019-08-04 14:31:55
@AC之心 %%%zyx
by disangan233 @ 2019-08-04 14:33:16
@vercont %%%神仙vercont
by ShineEternal @ 2019-08-04 14:34:29
@disangan233 orz您早就切爆IOI了
by hjxhjx @ 2019-08-04 14:39:52
orz
%%%
by Vn_nV @ 2019-08-04 14:42:21
@disangan233 这道题不算难吧
by IOI2021 @ 2019-08-04 14:42:37
最后一题不是枚举前后两个圆盘，然后组合数算吗？
by StarKnight @ 2019-08-04 14:59:46
@Vn_nV 自己想不简单鸭QwQ
by StarKnight @ 2019-08-04 15:00:31
@disangan233 史上第一和第二分别是啥？QAQ
by disangan233 @ 2019-08-04 17:28:32
@AC之心 去年D2T2T3