Submission #491433

#	Time	Username	Problem	Language	Result	Execution time	Memory
491433		levsog2004	Star triangles (IZhO11_triangle)	C++14	0 / 100	104 ms	13764 KiB

triangle

#include <iostream>
#include <fstream>
#include <algorithm>
#include <cstring>
#include <string>
#include <vector>
#include <cstdio>
#include <queue>
#include <deque>
#include <stack>
#include <cmath>
#include <list>
#include <set>
#include <map>
using namespace std;
typedef long long ll;
const long long N = 100005;
ll n, m, i, j, k, u, v, x, y, z, pat,d,e;
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	map <ll, ll> x, y;
	pair <ll, ll> a[N];
	cin >> n;
	for (i = 0; i < n; i++)
	{
		cin >> a[i].first>>a[i].second;
		x[a[i].second]++;
		y[a[i].first]++;
	}
	for (i = 0; i < n; i++)
	{
		pat += (x[a[i].second]-1 )* (y[a[i].first]-1);
	}
	cout << pat << endl;
		//system("pause");
	return 0;
}

• Subtask 1: 0 / 100