제출 #976053

#제출 시각아이디문제언어결과실행 시간메모리
976053vjudge1별들과 삼각형 (IZhO11_triangle)C++17
100 / 100
396 ms9068 KiB
#include <bits/stdc++.h>
#define int long long
#define ld long double
using namespace std;
const int n=3e5+5;

signed main(){
    int a; cin>>a;
    int ax[n], ay[n];
    map<int,int>jumlahx;
    map<int,int>jumlahy;
    for(int i=0;i<a;i++){
        cin>>ax[i]>>ay[i];
        jumlahx[ax[i]]++;
        jumlahy[ay[i]]++;
    }
    int ans=0;
    for (int i=0;i<a;i++){
        ans+=(jumlahx[ax[i]]-1)*(jumlahy[ay[i]]-1);
    }
    cout<<ans<<endl;
}
#Verdict Execution timeMemoryGrader output
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