Submission #914942

#	Time	Username	Problem	Language	Result	Execution time	Memory
914942		adaawf	Star triangles (IZhO11_triangle)	C++14	100 / 100	246 ms	12600 KiB

triangle

#include <iostream>
#include <map>
using namespace std;
int a[300005], b[300005];
map<int, int> ma, mb;
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i] >> b[i];
        ma[a[i]]++;
        mb[b[i]]++;
    }
    long long int res = 0;
    for (int i = 1; i <= n; i++) {
        res += 1ll * (ma[a[i]] - 1) * (mb[b[i]] - 1);
    }
    cout << res;
}

• Subtask 1: 100 / 100