Submission #17676

#	Time	Username	Problem	Language	Result	Execution time	Memory
17676		Adilkhan	Star triangles (IZhO11_triangle)	C++98	100 / 100	532 ms	13624 KiB

triangle

#include <bits/stdc++.h>

#define pb push_back
#define endl "\n"
#define mp make_pair 
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define fname ""
#define sz(x) (int)(x.size())

typedef long long ll;

using namespace std;

const ll N = (ll)(5e5) + 322;
const ll INF = (ll)(1e9);
const ll mod = (ll)(1e9) + 7;
const double eps = 1e-9;

ll n, x[N], y[N], ans;

map <ll, ll> X, Y;

int main () {
	ios_base :: sync_with_stdio (false); cin.tie(0);
//	freopen(fname".in", "r", stdin);
	//freopen(fname".out", "w", stdout);
	cin >> n;
	for (int i = 1; i <= n; ++i) {
		cin >> x[i] >> y[i];
		X[x[i]]++;
		Y[y[i]]++;
	}
	for (int i = 1; i <= n; ++i) {
		ans += (X[x[i]] - 1) * (Y[y[i]] - 1);
	}
	cout << ans;
	return 0;
}

• Subtask 1: 100 / 100