Submission #1219571

#	Time	Username	Problem	Language	Result	Execution time	Memory
1219571		lizi14	Star triangles (IZhO11_triangle)	C++20	0 / 100	0 ms	328 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin>>n;
    vector<pair<int,int>>v(n);
    for(int i=0; i<n; i++){
        int j,k;
        cin>>j>>k;
        pair<int,int>p={abs(j),abs(k)};
        v[i]=p;
    }
    long long ans=0;
    sort(v.begin(),v.end());
    for(int i=0; i<v.size(); i++){
        long long ans1=0,ans2=0;
        for(int j=0; j<v.size(); j++){
            if(v[j].first==v[i].first && j!=i)ans1++;
            //else if(v[j].first>v[i].first)break;
            if(v[j].second==v[i].second && i!=j)ans2++;
        }
        ans+=(ans2*ans1);
    }
    cout<<ans<<endl;
}

• Subtask 1: 0 / 100