Submission #142546

#	Time	Username	Problem	Language	Result	Execution time	Memory
142546		vardan__02	Star triangles (IZhO11_triangle)	C++14	0 / 100	2 ms	376 KiB

triangle

#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <queue>
#include <deque>
#include <cstring>
#include <string>
#include <set>
#define ll long long
#define ld long double
using namespace std;
ll i, j, n, m, k, p, q, a[300005], b[300005], x[300005], y[300005];
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin >> n;
	for (i = 1; i <= n; i++)
	{
		cin >> a[i] >> b[i];
		x[a[i]]++;
		y[b[i]]++;
	}
	for (i = 1; i <= n; i++)
		m += (x[a[i]] - 1)*(y[b[i]] - 1);
	cout << m << endl;
	return 0;
}

• Subtask 1: 0 / 100