Error Man 的博客

Mind controlThere is a wonderful country where people like eating very much. Each person has exactly one direct follower while the follower's follower is also follower of this man (of course the mos...

为什么求组合数取模，可以用 乘法逆元来做。所以求 组合数取模 就是求 % mod.对于正整数和 p，如果有 ，那么把这个同余方程中的最小正整数解叫做 a 模 p 的逆元。即如果% p = 1， 那么x的最小正整数解就是 a 的逆元。可以得到 % M () % M; //费马小定理所以% M =(% M )% M.ty...

E.Partial SumsYou've got an arraya, consisting ofnintegers. The array elements are indexed from 1 ton. Let's determine a two step operation like that:First we build by the arrayaan arrayso...

DetachmentTime Limit: 4000/2000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 4487 Accepted Submission(s): 1268Problem DescriptionIn a highly developed alien...