hdu 1213 How Many Tables

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1213

题目分类:并查集

代码

#include<stdio.h>
#include<iostream>
#include<algorithm>
using namespace std;

struct ST
{
    int a;
    int b;
}st[1005];

int cmp(ST x, ST y)
{
    if(x.a==y.a)
        return x.b < y.b;
    return x.a < y.a;
}

int Father[1005];

int Find(int x)
{
    if(x==Father[x])
        return x;
    return Find(Father[x]);
}

int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        int n, m;
        cin>>n>>m;
        for(int i=1;i<=n;i++)
            Father[i] = i;
        for(int i=1;i<=m;i++)
        {
            cin>>st[i].a>>st[i].b;
            int Fa = Find(st[i].a);
            int Fb = Find(st[i].b);
            if(Fa!=Fb)
                Father[Fb] = Fa;
        }
        int ans = 0;
        for(int i=1;i<=n;i++)
            if(Father[i]==i)
                ans++;
        cout<<ans<<endl;
    }
    return 0;
}

 

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