Submission #932442

#	Time	Username	Problem	Language	Result	Execution time	Memory
932442		Aiperiii	Star triangles (IZhO11_triangle)	C++14	100 / 100	410 ms	21824 KiB

triangle

#include <bits/stdc++.h>
#define int long long
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define pb push_back
using namespace std;
signed main(){
    ios_base::sync_with_stdio();
    cin.tie(0);cout.tie(0);
    int n;
    cin>>n;
    map <int,vector <int> > xy,yx;
    for(int i=0;i<n;i++){
        int x,y;cin>>x>>y;
        xy[x].pb(y);
        yx[y].pb(x);
    }
    int ans=0;
    for(auto i : xy){
        for(auto y : i.ss){
            ans+=((i.ss.size()-1)*(yx[y].size()-1));
        }
    }
    cout<<ans<<"\n";
}

• Subtask 1: 100 / 100