csp-回收站选址

#include<bits/stdc++.h>

using namespace std;

typedef pair<int,int> PII;

int cnt[5];

int main()
{
   
   
    int n;
    cin >> n;

    set<PII> s1;
    while(n--)
    {
   
   
        int x,y;
        cin >> x >> y;
        s1.<