POJ 1703 Find them, Catch them

种类并查集！！！

这里使用的两段区间求法！！两种种类并查集比较好理解，就是和你不同类的两个就是同类！！

表情分界线

AC代码如下：

#include <iostream>
#include <cstring>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
#define inf 2000000000
#define linf 1000000000000000000LL
#define dinf 1e200
#define pb push_back
#define mp make_pair
#define ll long long
#define sq(a) ((a)*(a))
#define ff(i,xi,n) for(int i=xi;i<=(int)(n);++i)
#define ffd(i,xi,n) for(int i=xi;i>=(int)(n);--i)
#define ffl(i,r) for(int i=head[r];i!=-1;i=edge[i].next)
#define ms(i,j) memset(i,j,sizeof(i))
#define M 200010
using namespace std;

int fa[M];

int findfa(int a)
{
    return a==fa[a]?a:fa[a]=findfa(fa[a]);
}

int main()
{
    int n,m;
    int t;
    char c;
    int a,b;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d%d",&n,&m);getchar();
        ff(i,0,2*n) fa[i]=i;
        ff(i,1,m) {scanf("%c%d%d",&c,&a,&b);getchar();
        if(c=='A'){
            if(findfa(a)==findfa(b))
                {printf("In the same gang.\n");continue;}
            if(findfa(a+n)==findfa(b)||findfa(a)==findfa(b+n))
                {printf("In different gangs.\n");continue;}
            printf("Not sure yet.\n");
        }
        else
        {
            fa[findfa(a)]=findfa(b+n);fa[findfa(b)]=findfa(a+n);//把不同类的放到后面区间去。
        }
        }
    }
    return 0;
}

POJ 1703 Find them, Catch them,布布扣,bubuko.com

POJ 1703 Find them, Catch them

原文：http://blog.csdn.net/hanhai768/article/details/38252315