Submission #724050

#	Time	Username	Problem	Language	Result	Execution time	Memory
724050		groshi	Star triangles (IZhO11_triangle)	C++17	100 / 100	373 ms	15576 KiB

triangle

#include<bits/stdc++.h>
#define int long long
using namespace std;
map<int,int> mapka1,mapka2;
int t[400000][2];
int32_t main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    int n,x,y;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>x>>y;
        mapka1[x]++;
        mapka2[y]++;
        t[i][0]=x;
        t[i][1]=y;
    }
    int wynik=0;
    for(int i=1;i<=n;i++)
    {
        int a=mapka1[t[i][0]];
        int b=mapka2[t[i][1]];
        wynik+=(a-1)*(b-1);
    }
    cout<<wynik;
    return 0;
}

• Subtask 1: 100 / 100