Tutte theorem 图 \(G=(V,E)\) 有完美匹配当且仅当满足 \(\forall U\subseteq V,o(G-U)\le|U|,o(X)\) 表示 X 子图的奇连通块数. Tutte–Berge formula 图 \(G=(V,E)\) 的最大匹配数为 \(\frac12\min\limits_{U\subseteq V}\{|U|-o(V-U)+|V|\}\) Tutte 定理证明 必要性 如果 G 有完美匹配,那么每个奇连通块至少有一个点需要与 U 中的点匹配,故得
http://acm.hdu.edu.cn/showproblem.php?pid=3037 Lucas定理模板. 现在才写,noip滚粗前兆QAQ #include<cstdio> #include<cstring> #include<algorithm> using namespace std; typedef long long ll; int jc[100003]; int p; int ipow(int x, int b) { ll t = 1, w = x;
Codeforces Round #258 (Div. 2) Devu and Flowers E. Devu and Flowers time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Devu wants to decorate his garden with flowers. He has purchased n boxes
A Simple Nim Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 980 Accepted Submission(s): 573 Problem Description Two players take turns picking candies from n heaps,the player who picks the l