POJ 2492 A Bug's Life 并查集

来源：互联网发布：it是什么意思编辑：程序博客网时间：2024/05/05 12:52

#include <iostream>#include<cstdio>using namespace std;int f[3000],relation[3000];void init(int n){    for(int i=0;i<=n;i++)    {        f[i]=i;        relation[i]=1;    }}int find(int x){    if(x==f[x]) return x;    int tem=f[x];    f[x]=find(f[x]);    relation[x]=(relation[x]+relation[tem]+1)%2;    return f[x];}void uni(int a,int b,int x,int y){    f[x]=y;    relation[x]=(relation[a]-relation[b])%2;}int main(){  //  freopen("cin.txt","r",stdin);    int t,n,m,x,y,flag,a,b;    scanf("%d",&t);        for(int cnt=1;cnt<=t;cnt++)        {            scanf("%d%d",&n,&m);            init(n);            flag=0;            while(m--)            {                scanf("%d%d",&x,&y);                if(flag) continue;                a=find(x),b=find(y);                if(a==b&&relation[x]==relation[y])                {                    flag=1;                    continue;                }                uni(x,y,a,b);//错这里了            }            printf("Scenario #%d:\n",cnt);            if(flag) printf("Suspicious bugs found!\n");            else printf("No suspicious bugs found!\n");            printf("\n");        }    return 0;}

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