ZOJ 3526 Weekend Party

Weekend Party

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Time Limit: 2 Seconds      Memory Limit: 65536 KB

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As the only Oni (a kind of fabulous creature with incredible strength and power) living on the surface of Gensokyo, Ibuki Suika has an interest in gatheringHumans and Youkai in Gensokyo and holding party every day.

Today Suika has asked several friends to participate in a weekend party, which will be held at Hakurei Shrine as usual. Though Gensokyo was isolated from the outside world, everyone here is still a fan of ACG (Anime, Comic and Game). Of course, some people may only like parts of ACG. For example, Reimulikes Anime and Game, Marisa only likes Comic but Kaguya likes all of them.

In order to make everyone enjoy the party, Suika decide to arrange them into a circle so that everyone can have at least one common interest with both left and right hand side, which means one has at least a common interest with left AND has at least a common interest with right. By the way, Suika knows all her friends' interest. Please find out if she can get an arrangement of seats that satisfies the constraint described above.

Input

There are multiple test cases. For each test case:

The first line contains an integer N (1 <= N <= 64) indicates the number of girls in Gensokyo. Then followed by N lines, each line contains two strings A_i andB_i (each contains only alphanumeric characters). A_i represents the name of the i-th girl and the length of it will not exceed 10. B_i is a non-empty subset of "ACG".

Output

For each test case, output "Yes" if there exists at least one arrangement of seats, otherwise output "No".

Sample Input

1
Reimu AG
2
Reimu AG
Marisa C
3
Reimu AG
Marisa C
Kaguya GAC

Sample Output

Yes
No
No

题意：告诉n个人，每一个人都有AGC这三个爱好中的一种或多种。聚会时间，大家坐成一个圈。为了让大家都欢乐。那么就要保证每一个人左右两边的人都和他有共同爱好。

思路：仅仅有三个爱好嘛，情况比較少，所以能够直接暴力枚举。先用map缩一下点。方便讨论，然后找一个讨论对象，AGC这样的万能的就无需过多考虑，AG AC GC也还好，可是对于单个爱好的人。就会比較棘手。所以我们选择单个爱好的人作为突破口。感觉代码凝视已经非常具体了。还是不懂滴。能够留言

#include <iostream>
#include <stdio.h>
#include <string>
#include <cstring>
#include <cmath>
#include <algorithm>
#include <map>
using namespace std;

int n;
string s,a;

int main()
{
    while(~scanf("%d",&n))
    {
        map<string,int>mp;
        for(int i=0;i<n;i++)
        {
            cin>>a>>s;mp[s]++;
        }

        int A=mp["A"];
        int C=mp["C"];
        int G=mp["G"];
        int AG=mp["AG"]+mp["GA"];
        int AC=mp["AC"]+mp["CA"];
        int GC=mp["GC"]+mp["CG"];
        int AGC=mp["AGC"]+mp["ACG"]+mp["CGA"]+mp["CAG"]+mp["GCA"]+mp["GAC"];

        //cout<<"A="<<A<<" "<<"C="<<C<<" "<<"G="<<G<<endl;

        //cout<<"AG="<<AG<<" "<<"AC="<<AC<<" "<<"GC="<<GC<<endl;
        //cout<<"AGC="<<AGC<<endl;

        if( (A+AC+AG+AGC==n) || (C+AC+AGC+GC==n) || (G+AG+GC+AGC==n) )//一个
         {
             puts("Yes");
             //cout<<"********1"<<endl;
             continue;
         }
        if( (A==0&&(GC+AGC>=2)) || (C==0 && (AG+AGC)>=2 ) || (G==0 && (AC+AGC)>=2 ))//两个
         {
             puts("Yes");
             //cout<<"********2"<<endl;
             continue;
         }
        if( (AG?1:0)+(GC?1:0)+(AC?
1:0)+AGC>=3 )//三个
         {
             puts("Yes");
             //cout<<"********3"<<endl;
             continue;
         }

         if( (AC>=2&&AG>=2) || (AG>=2&&GC>=2) || (GC>=2&&AC>=2) )//三个
         {
             puts("Yes");
             //cout<<"********4"<<endl;
             continue;
         }

//对于这样的没有的情况，事实上上面已经包括了。比如：假设仅仅有AC AG GC中的两个（AGC比較特殊，能够无所谓）那么在第一种情况就推断了。能够输出Yes,假设三个都有，那

//么在第三种情况也会考虑到。所以输出Yes.
//        if( (A==0&&C==0&&G==0) && ( (AG>=1&&AC>=1) || (AC>=1&&GC>=1) || (GC>=1&&AG>=1) || AGC>=2) )//没有
//         {
//             puts("Yes");
//              //cout<<"********4"<<endl;
//             continue;
//         }

         puts("No");
    }
    return 0;
}

/*
5
fd A
fdfd G
fsd C
ds AG
fsf CA
*/