Submission #975151

#	Time	Username	Problem	Language	Result	Execution time	Memory
975151		vjudge1	Star triangles (IZhO11_triangle)	C++17	100 / 100	391 ms	14320 KiB

triangle

#include <bits/stdc++.h>

using namespace std;

const int maxN = 3e5+7;

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

    long long x[maxN], y[maxN];
    map<int, int> cntX, cntY;
    
    for(int i = 0; i < q; i++)
    {
        cin >> x[i] >> y[i];
        cntX[x[i]]++;
        cntY[y[i]]++;
    }

    long long ans = 0;
    for(int i = 0; i < q; i++){
        ans += (cntX[x[i]] - 1) * (cntY[y[i]] - 1);
    }

    cout << ans << endl;
    return 0;
}

• Subtask 1: 100 / 100