Submission #975533

#	Time	Username	Problem	Language	Result	Execution time	Memory
975533		vjudge1	Star triangles (IZhO11_triangle)	C++17	100 / 100	249 ms	15684 KiB

triangle

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define Foxfur ios_base::sync_with_stdio(0);cin.tie(NULL);

int32_t main()
{
Foxfur

    int n; cin >> n;
    int maxn = 3e5+5;

    map <int,int> jmlx;
    map <int, int> jmly;

    int arrx[maxn];
    int arry[maxn];

    for(int i=0; i<n; i++)
    {
        cin >> arrx[i] >> arry[i];
        jmlx[arrx[i]]++;
        jmly[arry[i]]++;
    }

    int ans=0;

    for(int i=0; i<n; i++)
    {
        ans += 1ll * (jmlx[arrx[i]]-1) * (jmly[arry[i]]-1);
    }

    cout << ans << endl;
}

• Subtask 1: 100 / 100