Submission #1112855

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112855		Pishka12	Star triangles (IZhO11_triangle)	C++14	100 / 100	304 ms	15828 KiB

triangle

#include <bits/stdc++.h>
#define ll long long
#define f first
#define s second
using namespace std;
 
int main() 
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    ll n;
    cin>>n;
    map<ll,ll> ax;
    map<ll,ll> ay;
    vector<pair<ll,ll>> le(n+1);
    for(int i = 1;i<=n;i++) {
      ll x,y;
      cin>>x>>y;
      le[i] = {x,y};
      ax[x]++;
      ay[y]++;
    }
    ll ans = 0;
    for (int i=1;i<=n;i++) {
      ans += (ax[le[i].f]-1)*(ay[le[i].s]-1);
    }
    cout<<ans<<endl;
    return 0;
}

• Subtask 1: 100 / 100