Submission #1116980

#	Time	Username	Problem	Language	Result	Execution time	Memory
1116980		kirakosyan	Star triangles (IZhO11_triangle)	C++17	100 / 100	300 ms	15688 KiB

triangle

#include<algorithm>
#include<iostream>
#include<vector>
#include<string>
#include<random>
#include<cmath>
#include<stack>
#include<map>
#include <iomanip> 
#include <queue>
#include <set>
using namespace std;
using ll = long long;
using ull = unsigned long long;
ll mod = 1e9 + 7;
ll pv(ll a, ll b) {
    if (b == 0)return 1;
    ll res = (pv(a, b / 2));
    if (b % 2) {
        return (((res * res) % mod) * (a % mod)) % mod;
    }
    else {
        return (res * res) % mod;
    }
}

void solve() {
    ll n; cin >> n;
    vector<ll>x(n), y(n);
    map<ll, ll>mp, mp1;
    for (ll i = 0; i < n; i++) {
        cin >> x[i] >> y[i];
        mp[x[i]]++;
        mp1[y[i]]++;

    }
    ll ans = 0;
    for (int i = 0; i < n; i++) {
        ans += ((mp[x[i]] - 1) * (mp1[y[i]] - 1));
    }
    cout << ans << endl;


}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cin.tie(nullptr);

    ll _ = 1;
    //cin >> _;
    while (_--)
    {
        solve();
    }
}

• Subtask 1: 100 / 100