Submission #1280929

#	Time	Username	Problem	Language	Result	Execution time	Memory
1280929		SSKMF	Star triangles (IZhO11_triangle)	C++20	100 / 100	247 ms	5864 KiB

triangle

#include <bits/stdc++.h>
using namespace std;

pair <int , int> coordonate[300001];
map <int , int> aparitii[2];

int main ()
{
    ios :: sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

    int cantitate;
    cin >> cantitate;

    for (int indice = 0 ; indice < cantitate ; indice++)
    {
        cin >> coordonate[indice].first >> coordonate[indice].second;
        aparitii[1][coordonate[indice].second]++;
        aparitii[0][coordonate[indice].first]++;
    }

    int64_t modalitati = 0;
    for (int indice = 0 ; indice < cantitate ; indice++)
        { modalitati += 1LL * (aparitii[0][coordonate[indice].first] - 1) * (aparitii[1][coordonate[indice].second] - 1); }

    cout << modalitati;
    return 0;
}

• Subtask 1: 100 / 100