全程膜拜 码得都要一样了.. 对于这种数列置换的可以理解成多个环,而对于一个大小为d的环把顺序弄对要做d-1次 总起来就是n-环数的次数 加上暴力30pt到手啦 假如题目没有限制,那就是第一类斯特林数,因为点有序再乘一个所有点的全排列 又20pt到手啦,考场上就溜了 先缩链,一条链只有头和尾是有用的 现在考虑分情况讨论.如果我们让第一个数列的数字连向第二个数列的对应数字(或许这样理解环容易些),将有四种情况:上面是否有当前数字,下面是否有当前数字.给出的限制相当于提前先给了一些链 假如用二进制表…

Greedy Gift Givers A group of NP (2 ≤ NP ≤ 10) uniquely named friends has decided to exchange gifts of money. Each of these friends might or might not give some money to any or all of the other friends. Likewise, each friend might or might not receiv…

B. The Best Gift time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Emily's birthday is next week and Jack has decided to buy a present for her. He knows she loves books so he goes to the loc…

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Gift Hunting Time Limit: 6000/3000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1418 Accepted Submission(s): 471 Problem Description After winning two coupons for the largest shopping mart in your city, you can't wa…

B. The Best Gift 题目连接: http://www.codeforces.com/contest/609/problem/B Description Emily's birthday is next week and Jack has decided to buy a present for her. He knows she loves books so he goes to the local bookshop, where there are n books on sale…

GTY's birthday gift                                                                       Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)                                                                            …

1328 - A Gift from the Setter   Problem setting is somewhat of a cruel task of throwing something at the contestants and having them scratch their head to derive a solution. In this problem, the setter is a bit kind and has decided to gift the contes…

 Greedy Gift Givers  The Problem This problem involves determining, for a group of gift-giving friends, how much more each person gives than they receive (and vice versa for those that view gift-giving with cynicism). In this problem each person sets…

GTY's birthday gift Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)  [Problem Description] FFZ's birthday is coming. GTY wants to give a gift to ZZF. He asked his gay friends what he should give to ZZF. One of them…