Submission #1100600

#	Time	Username	Problem	Language	Result	Execution time	Memory
1100600		vjudge1	Star triangles (IZhO11_triangle)	C++98	100 / 100	392 ms	7204 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
signed main()
{
    int n;
    cin >> n;
    int x[400000], y[400000];
    map<int, int> mp1, mp2;
    for(int i = 0; i < n; i++)
    {
        cin >> x[i] >> y[i];
        mp1[x[i]]++;
        mp2[y[i]]++;
    }
    int k = 0;
    for(int i = 0; i < n; i++)
    {
        k += (mp1[x[i]] - 1) * (mp2[y[i]] - 1);
    }
    cout << k;
}

• Subtask 1: 100 / 100