Submission #1080142

#	Time	Username	Problem	Language	Result	Execution time	Memory
1080142		MrPavlito	Star triangles (IZhO11_triangle)	C++17	100 / 100	272 ms	15596 KiB

triangle

#include <bits/stdc++.h>
#define int long long
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define sc second
#define endl "\n"
#define pii pair<int,int>

using namespace std;

const int MAXN = 1e5+5;
const int mod7 = 1e9+7;
const long long inf = 1e18;

signed main()
{
    ios_base::sync_with_stdio(false),cin.tie(0), cout.tie(0);
    int tt=1;
    //cin >> tt;
    while(tt--)
    {
        int n;
        cin >> n;
        vector<pii> niz(n);
        map<int,int> xovi;
        map<int,int> yovi;
        for(int i=0; i<n; i++)
        {
            cin >> niz[i].fi >> niz[i].sc;
            xovi[niz[i].fi] ++;
            yovi[niz[i].sc] ++;
        }
        int rez = 0;
        for(int i=0; i<n; i++)
        {
            pii tr = niz[i];
            rez+=(xovi[tr.fi]-1)*(yovi[tr.sc]-1);
        }
        cout << rez << endl;

    }
}

• Subtask 1: 100 / 100