Problem Description SJX has 2*N magic gems. N of them have Yin energy inside while others have Yang energy. SJX wants to make a necklace with these magic gems for his beloved BHB. To avoid making the necklace too Yin or too Yang, he must place these…

题目大概说有n个yang珠子n个yin珠子,要交替串成一个环形项链,有些yang珠子和某个yin珠子相邻这个yang珠子会不高兴,问最少有几个yang珠子不高兴. 自然会想到直接用状压DP去解,转移很烦,也没写出来.标程是搜索不明觉厉..听闻了可以枚举一边的顺序,8!,然后用最大匹配解决. 然后想到的是枚举yang的顺序,然后对于每一个yang去其匹配下一个的yin,即X部是yang,而Y部是yin.不过这样开头那个yang可能出现少算的情况..这个搞了好久都不行.. 其实,枚举yin的顺序,X…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5727 题意:有N个阴珠子和N个阳珠子,特定序号的阴阳珠子放在一起会让阳珠子暗淡.现在问排放成一个环,如何排放能让暗淡的阳珠子尽可能地少. 既要考虑阳珠子的位置也要考虑阴珠子的位置,可以先枚举阴珠子成环的全排列,由于成环所以N个珠子只需要枚举N-1个数的全排列.每一次固定阴珠子的一个排列,这时候阳珠子和阴珠子的位置确定了.下面看看有多少对阴阳珠子的结合会使相邻的阳珠子暗淡,二分图跑出暗淡的阳珠子数,用…

http://acm.hdu.edu.cn/showproblem.php?pid=5727 题意:n个珠子,每个珠子有阴阳两种属性,且阴的一定和阳的紧邻,排成一个环:m行,每行两个数,表示阳性x珠子和y阴性珠子相邻则功能减弱,问功能减弱珠子最少有几个 思路:二分匹配 全排列阴性珠子,因为是环,O((n-1)!):枚举每个阳性珠子,插入i位置,前提是i前后两个阴性珠子都不与阳性珠子有排斥作用: 最后问题变转化成,阳性珠子和位置的最大匹配问题 // #pragma comment(linker,…

题目 Source http://acm.hdu.edu.cn/showproblem.php?pid=5730 Description Perhaps the sea‘s definition of a shell is the pearl. However, in my view, a shell necklace with n beautiful shells contains the most sincere feeling for my best lover Arrietty, but…

Shell Necklace Time Limit: 16000/8000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 534    Accepted Submission(s): 227 Problem Description Perhaps the sea‘s definition of a shell is the pearl. However, in my view,…

Necklace/center> 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5727 Description SJX has 2*N magic gems. N of them have Yin energy inside while others have Yang energy. SJX wants to make a necklace with these magic gems for his beloved BHB. To avoid…

Necklace Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 2083    Accepted Submission(s): 747 Problem Description Mery has a beautiful necklace. The necklace is made up of N magic balls. Each ba…

/* ID: vincent63 LANG: C TASK: beads */ #include <stdio.h> #include<stdlib.h> #include<string.h> int findmax(char s[],int n){ int i,j,count,max,l,r; char left,right; max=; count=; int p; ,j=;j<n;i++,j++){ l=i; r=j; while(s[l]=='w'){ l…

[BZOJ1789][BZOJ1830][Ahoi2008]Necklace Y型项链 试题描述 欢乐岛上众多新奇的游乐项目让小可可他们玩的非常开心.现在他们正在玩比赛串项链的游戏,谁串的最快就能得到优厚的奖品.这可不是普通的项链,而是一种Y型项链,项链的最中间有一颗大珍珠作为结合点,从大珍珠上连出来3条由各种宝石串起来的链子.比赛的规则是这样的:每次可以从三条链子中某一条的一端取下来一个宝石,或者安上去一个宝石,称为一次操作,经过若干次操作,最终使得三条链子完全相同.想要赢得比赛,那么只能使用…