Submission #1211771

#	Time	Username	Problem	Language	Result	Execution time	Memory
1211771		michael12	Star triangles (IZhO11_triangle)	C++20	100 / 100	385 ms	6936 KiB

triangle

#include<bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define ll long long
using namespace std;
int main(){
    long long tt;
    cin >> tt;
    map<long long, long long> mp, mp1;
    int ans[tt], ans1[tt];
    for(long long i = 0; i < tt; i++){
        
        cin  >> ans[i] >> ans1[i];
        mp[ans[i]]++;
        mp1[ans1[i]]++;
    }
    long long s = 0;
    for(long long i = 0; i < tt; i++){
      s += (mp[ans[i]] - 1) * (mp1[ans1[i]] - 1);
    }
    cout << s;
    


}

• Subtask 1: 100 / 100