Submission #304150

#	Time	Username	Problem	Language	Result	Execution time	Memory
304150		_Ibrohim_	Star triangles (IZhO11_triangle)	C++14	100 / 100	579 ms	15736 KiB

triangle

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define fr first
#define sc second
#define ld long double

using namespace std;

    const ll N = 3e5 + 7;
    const ll mod = 1e9 + 7;

ll n , x[N] , y[N];
map < ll , ll > X , Y;

void solve(){
    cin >> n;
    for(int i = 1; i <= n; ++ i){
        cin >> x[i] >> y[i];
        X[x[i]] ++;
        Y[y[i]] ++;
    }
    ll ans = 0;
    for(int i = 1; i <= n; ++ i){
        X[x[i]] --;
        Y[y[i]] --;
        ans += X[x[i]] * Y[y[i]];
        X[x[i]] ++;
        Y[y[i]] ++;
    }
    cout << ans;
}

main(){
/// ******************************
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    ll tt = 1;
/// ******************************

    //cin >> tt;
    while(tt --){
        solve();
    }
    return 0;
}

/**



**/

Compilation message (stderr)

triangle.cpp:34:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   34 | main(){
      |      ^

• Subtask 1: 100 / 100