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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#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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