제출 #1072349

#제출 시각아이디문제언어결과실행 시간메모리
1072349coolboy19521별들과 삼각형 (IZhO11_triangle)C++17
100 / 100
482 ms12252 KiB
#include "bits/stdc++.h"
#define ll long long

using namespace std;

const int sz = 3e5 + 15;

pair<int,int> ps[sz];

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

    map<int,int> cx, cy;

    for (int i = 0; i < n; i ++) {
        int x, y;
        cin >> x >> y;

        cx[x] ++, cy[y] ++;
        ps[i] = make_pair(x, y);
    }

    ll r = 0;

    for (int i = 0; i < n; i ++) {
        int x, y;
        tie(x, y) = ps[i];
        cx[x] --, cy[y] --;
        r += cx[x] * cy[y];
        cx[x] ++, cy[y] ++;
    }

    cout << r << '\n';
}
#Verdict Execution timeMemoryGrader output
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