poj 1703

//  hnldyhy(303882171)  17:07:57
//  poj 1703

#include <stdio.h>
int p[200005];

void init(int n)
{
    for (int i=1;i<=2*n;i++)    p[i]=i;
}

int find(int x)
{
    if (x==p[x]) return x;
    return  p[x]=find(p[x]);
}

int main()
{
    int n,m,a,b,test;
    char c[10];
    scanf("%d",&test);
    while (test--)
    {
        scanf("%d%d",&n,&m);
        init(n);
        for (int i=1;i<=m;i++)
        {
            scanf("%s%d%d",c,&a,&b);
            if (c[0]==‘A‘)
            {
                if ( find(a)!=find(b) && find(a)!=find(b+n) )
                    printf("Not sure yet.\n");
                else if  ( find(a)==find(b) ) printf("In the same gang.\n");
                else  printf("In different gangs.\n");
            }
            else  //‘D  a  b‘
            {
                if ( find(a)!=find(b+n) )
                {
                    p[find(a)]=find(b+n); //不在同一集合
                    p[find(b)]=find(a+n); //不在同一集合
                }
            }
        }
    }
    return  0;
}

**********************************************************************



芯馨(396842689)  17:
25:
53
#include<iostream>
#include<cstdio>
using namespace std;
#define N 500001
int ei[N],rank[N];

void init(int n)
{
    for (int i=1;i<=n;i++)
        ei[i]=i,rank[i]=0;
}

int find(int x)
{
    if (ei[x]==x) return x;
    int tt=ei[x];
    ei[x]=find(ei[x]);
    rank[x]=(rank[x]+rank[tt])%2;
    return ei[x];
}

void set(int x,int y)
{
    int xx=find(x),yy=find(y);
    if (xx!=yy)
    {
        ei[yy]=xx;
        rank[yy]=(rank[x]+rank[y]+1)%2;
    }
}
int main()
{
    char ch;
    int i,x,y;
    int n,m;
    int t;
    scanf("%d",&t);
    while (t--)
    {
        scanf("%d%d",&n,&m);
        init(n);
        for (i=1;i<=m;i++)
        {
            scanf("\n%c %d %d",&ch,&x,&y);
            if (ch==‘D‘)
                set(x,y);
            else
            {
                int xx=find(x),yy=find(y);
                if (xx!=yy)
                    printf("Not sure yet.\n");
                else
                {
                    if (rank[x]==rank[y])
                        printf("In the same gang.\n");
                    else
                        printf("In different gangs.\n");
                }
            }
        }
    }
    return 0;
}