제출 #46822

#제출 시각아이디문제언어결과실행 시간메모리
46822Nnandi별들과 삼각형 (IZhO11_triangle)C++14
100 / 100
474 ms40048 KiB
#include <bits/stdc++.h>
using namespace std;

map<int,int> x;
map<int,int> y;
vector<pair<int,int> > pont;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int n;
    cin>>n;
    for(int i=0;i<n;i++) {
        int a, b;
        cin>>a>>b;
        x[a]++;
        y[b]++;
        pont.push_back(make_pair(a,b));
    }
    long long sol=0LL;
    for(auto ez:pont) {
        sol+=(x[ez.first]-1)*(y[ez.second]-1);
    }
    cout<<sol<<endl;
    return 0;
}
#Verdict Execution timeMemoryGrader output
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