Submission #1219528

#	Time	Username	Problem	Language	Result	Execution time	Memory
1219528		theiulius	Star triangles (IZhO11_triangle)	C++20	100 / 100	463 ms	20132 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define int long long
#define ff first
#define ss second
#define pb push_back
int n;
const int N = 2e5+5;



main(){
    /*ifstream cin(".in");
    ofstream cout(".out");*/
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    
    
    cin >> n;
    map<int, vector<int>> xs, ys;
    int x[n] = {}, y[n] = {};
    for (int i = 0; i < n; i++){
        cin >> x[i] >> y[i];
        
        xs[y[i]].pb(x[i]);
        ys[x[i]].pb(y[i]);
    }
    
    int ans = 0;
    for (int i = 0; i < n; i++){
        ans += (xs[y[i]].size() - 1) * (ys[x[i]].size() - 1);
    }
    cout << ans << endl;
}

Compilation message (stderr)

triangle.cpp:13:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   13 | main(){
      | ^~~~

• Subtask 1: 100 / 100