Submission #600293

#	Time	Username	Problem	Language	Result	Execution time	Memory
600293		Codula	Star triangles (IZhO11_triangle)	C++17	100 / 100	387 ms	15500 KiB

triangle

//IOI 2023 I am coming.
 
#include "bits/stdc++.h"
 
using namespace std;
 
#define fast ios_base::sync_with_stdio(false);cin.tie(nullptr)
#define int int64_t
#define pb push_back 
#define x first
#define y second
 
int32_t main(){
	fast;
	int n;
	cin>>n;
	map<int,int>dx,dy;
	vector<pair<int,int>>point(n);
	for(int i=0;i<n;++i){
		cin>>point[i].x>>point[i].y;
		dx[point[i].x]++;
		dy[point[i].y]++;
	}
	int ans=0;
	for(int i=0;i<n;++i){
		ans+=(dx[point[i].x]-1)*(dy[point[i].y]-1);
	}
	cout<<ans<<"\n";
    return 0;
}

• Subtask 1: 100 / 100