Submission #976934

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
976934	2024-05-07 09:24:11	ArgoCahaya	Star triangles (IZhO11_triangle)	C++14	100 / 100	277 ms	17152 KiB

triangle

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#include<bits/stdc++.h>
#define ll long long
#define endl "\n"
#define fi first
#define se second
#define pb push_back
#define pll pair<long long, long long>
using namespace std;
void solve(){
  ll n;
  cin >> n;
  map<ll,ll> x;
  map<ll,ll> y;
  vector<pll> v;
  for(int i=1;i<=n;i++){
    ll a,b;
    cin >> a >> b;
    x[a]++;
    y[b]++;
    v.pb({a,b});
  }
  ll ans = 0;
  for(auto i:v){
    ans += (x[i.fi]-1) * (y[i.se]-1);
  }
  cout << ans << endl;
}
 
 
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• Subtask 1: 100 / 100