Submission #335612

#	Time	Username	Problem	Language	Result	Execution time	Memory
335612		StanCatalin	Star triangles (IZhO11_triangle)	C++14	0 / 100	1 ms	492 KiB

triangle

#include <iostream>
#include <algorithm>
#include <fstream>

using namespace std;

ifstream in("triangles.in");
ofstream out("triangles.out");

const int dim = 3e5 + 5;

int n,lin[dim],col[dim];
pair<int,int> a[dim];

int main()
{
    cin >> n;
    for (int i=1; i<=n; i++)
    {
        cin >> a[i].first >> a[i].second;
        lin[a[i].first]++;
        col[a[i].second]++;
    }
    int ans = 0;
    for (int i=1; i<=n; i++)
    {
        ans += (lin[a[i].first] - 1) * (col[a[i].second] - 1);
    }
    cout << ans;
    return 0;
}

• Subtask 1: 0 / 100