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    Today is Ignatius' birthday. He invites a lot of friends. Now it's dinner time. Ignatius wants to know how many tables he needs at least. You have to notice that not all the friends know each other, and all the friends do not want to stay with strangers. 

    One important rule for this problem is that if I tell you A knows B, and B knows C, that means A, B, C know each other, so they can stay in one table. 

    For example: If I tell you A knows B, B knows C, and D knows E, so A, B, C can stay in one table, and D, E have to stay in the other one. So Ignatius needs 2 tables at least. 
    Input
    The input starts with an integer T(1<=T<=25) which indicate the number of test cases. Then T test cases follow. Each test case starts with two integers N and M(1<=N,M<=1000). N indicates the number of friends, the friends are marked from 1 to N. Then M lines follow. Each line consists of two integers A and B(A!=B), that means friend A and friend B know each other. There will be a blank line between two cases.
    Output
    For each test case, just output how many tables Ignatius needs at least. Do NOT print any blanks. 
    Sample Input
    2
    5 3
    1 2
    2 3
    4 5
    
    5 1
    2 5
    Sample Output
    2
    4

    这个为什么TEL

    Select Code
    #include <stdio.h>
    #include <string.h>
    #define Maxn 1005
    int par[Maxn],count=0;
    void init(int n)
    {
    	for(int i=0; i<n; i++)
    	par[i]=i;
    }
    int find(int x)
    {
    	int r=x;
    	while(par[r]!=r)
    	{
    		r=par[r];
    	}
    	int i=x,j;
    	while(i!=r)
    	{
    		j=par[r];
    		par[r]=i;
    		i=j;
    	}
    	return r;
    }
    
    void join(int x, int y)
    {
    	int fx=find(x), fy=find(y);
    	if(fx!=fy)
    	{
    		par[fx]=fy;
    		count++;
    	}
    }
    int main()
    {
    	int i,j,a,b,n;
    	scanf("%d",&n);
    	while(n--)
    	{
    		count=0;
    		scanf("%d%d",&a,&b);
    		init(a);
    		while(b--)
    		{
    			scanf("%d%d",&i,&j);
    			join(i,j);
    		}
    		printf("%d
    ",a-count);
    	}
    	
    	
    	return 0;
    }

    AC代码



    Select Code
    #include <iostream>  
    #include<cstdio>  
    #include<cmath>  
    #include<cstring>  
      
    using namespace std;  
      
    int pre[1100];  
      
    int findset(int v)  
    {  
        int t1,t2=v;  
        while(v!=pre[v])    v=pre[v];  
        while(t2!=pre[t2])  
        {  
            t1=pre[t2];  
            pre[t2]=v;  
            t2=t1;  
        }  
        return v;  
    }  
      
    void unions(int x,int y)  
    {  
        int t1=findset(x);  
        int t2=findset(y);  
        if(t1!=t2)  pre[t1]=t2;  
    }  
      
    int main()  
    {  
        int T,n,m;  
        cin>>T;  
        while(T--)  
        {  
            cin>>n>>m;  
            for(int i=1;i<=n;i++)   pre[i]=i;  
            for(int i=0;i<m;i++)  
            {  
                int u,v;  
                scanf("%d%d",&u,&v);  
                unions(u,v);  
            }  
            int ans=0;  
            for(int i=1;i<=n;i++)  
                if(pre[i]==i)   ans++;  
            cout<<ans<<endl;  
      
        }  
    }  









    永远渴望,大智若愚(stay hungry, stay foolish)
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  • 原文地址:https://www.cnblogs.com/h-hkai/p/7406508.html
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