Submission #975435

#	Time	Username	Problem	Language	Result	Execution time	Memory
975435		vjudge1	Star triangles (IZhO11_triangle)	C++17	100 / 100	392 ms	15704 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
    int n;
    cin >> n;
    int x[n], y[n];
    map<int, int> cntx, cnty;
    for(int i = 0; i<n; i++){
        cin >> x[i] >> y[i];
        cntx[x[i]]++;
        cnty[y[i]]++;
    }
    int ans = 0;
    for(int i = 0; i<n; i++){
        int xx = cntx[x[i]];
        int yy = cnty[y[i]];
        if(xx == 0 || yy == 0) continue;
        ans += (xx - 1)*(yy - 1);
    }
    cout << ans << endl;
}

• Subtask 1: 100 / 100