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MARK..第一个用标准并查集过的题目&&第一次套用模板

Posted by zjut020 at 2008-12-29 22:26:45 on Problem 2236
#include<iostream>
#include<fstream>
#include<vector>
#define MAXN 1003
#define  _ufind_run(x) for(;p[t=x];x=p[x],p[t]=(p[x]?p[x]:x))
#define _run_both _ufind_run(i);_ufind_run(j)
using namespace std;
int p[MAXN],t;int n,d,l[1004][2];
void init(){memset(p,0,sizeof(p));}
void set_friend(int i,int j){_run_both;p[i]=(i==j?0:j);}
int is_friend(int i,int j){_run_both;return i==j&&i;}
bool id(int i,int j)
{
    if((l[i][0]-l[j][0])*(l[i][0]-l[j][0])+(l[i][1]-l[j][1])*(l[i][1]-l[j][1])>d*d) 
    return 0;
    return 1; 
}
int main()
{
    //ifstream cin("0.txt");
    vector<int>red;
    init();
    
    int i,j,m,a,b;
    cin>>n>>d;
    for(i=1;i<=n;i++)
    cin>>l[i][0]>>l[i][1];
    char c;
    while(cin>>c)
    {
        if(c=='O')
        {
             cin>>m;
             for(int i=0;i<red.size();i++)
             if(id(m,red[i])&&!is_friend(m,red[i])) 
             set_friend(m,red[i]);  
             red.push_back(m);      
        }   
        else if(c=='S')
        {
             cin>>a>>b;
             if(is_friend(a,b)) 
             cout<<"SUCCESS"<<endl;
             else cout<<"FAIL"<<endl;    
        }          
    }
   // system("pause");
    return 0;  
}

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