Submission #166747

#	Time	Username	Problem	Language	Result	Execution time	Memory
166747		Dilshod_Imomov	Star triangles (IZhO11_triangle)	C++17	0 / 100	2 ms	376 KiB

triangle

# include <bits/stdc++.h>
//# pragma GCC optimize("Ofast")
# define pb push_back
# define ll long long
# define fi first
# define se second
# define all(vc) vc.begin(),vc.end()
# define forn(i, n) for (int i = 0; i < int(n); i++)
# define ford(i, n) for (int i = int(n) - 1; i >= 0; i--)
# define fore(i, l, r) for (int i = int(l); i < int(r); i++)
# define in freopen("input.txt", "r", stdin)
# define speed ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
# define time cerr << "\nTime elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n"
  
using namespace std;
  
const ll INF = 1e18;
const int mod = 1e9 + 7;
const ll N = 1e7 + 7; 

map < ll, ll > x, y;
pair < ll, ll > p[N];
   
int main()
{      
    speed;
    ll n;
    cin >> n;
    forn( i, n ) {
        cin >> p[i].fi >> p[i].se;
        x[ p[i].fi ]++;
        y[ p[i].se ]++;
    }
    ll ans = 0;
    forn( i, n ) {
        ans += max( 0ll, x[ p[i].fi ] - 1 ) * max( 0ll, x[ p[i].se ] - 1 );
    }
    cout << ans;
    //time;
}

• Subtask 1: 0 / 100