hdoj1856

More is better

/***************************************************************\
 *Author: 小呼
 *Created Time: Mon 12 Jul 2010 09:21:56 AM CST
 *File Name: a.cpp
 *Description://并查集，增加信心的题目
\***************************************************************/
//*========================*Head File*========================*\\

#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
/*----------------------*Global Variable*----------------------*/
int frd[10000001];
int A,B,n;
//*=======================*Main Program*=======================*//
using namespace std;

int find(int x){
    if(frd[x]>0)
      frd[x]=find(frd[x]);
    return frd[x]>0?frd[x]:x;
}
void union_set(int x,int y){
    x=find(x);y=find(y);
    if(find(x)<find(y)){
        frd[x]+=frd[y];
        frd[y]=x;
    }
    else{
        frd[y]+=frd[x];
        frd[x]=y;
    }
}

int main(){
    //freopen("input","r",stdin);
    while(scanf("%d",&n)!=EOF){
        int res=-1;
        memset(frd,-1,sizeof(frd));
        for(int i=1;i<=n;++i){
            scanf("%d%d",&A,&B);
            A=find(A);
            B=find(B);
            if(A!=B){
                int temp=frd[A]+frd[B];
                res=res<temp?res:temp;
                union_set(A,B);
            }
        }
        printf("%d\n",-1*res);
    }
    return 0;
}