Submission #901105

#	Time	Username	Problem	Language	Result	Execution time	Memory
901105		LCJLY	Star triangles (IZhO11_triangle)	C++14	100 / 100	279 ms	15696 KiB

triangle

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl; 
#define show4(x,y) for(auto it:x) cout << it << " "; cout << #y << endl;
typedef pair<long long,long long>pii;

void solve(){	
	int n;
	cin >> n;
	pii arr[n];
	map<int,int>hori;
	map<int,int>vert;
	for(int x=0;x<n;x++){
		cin >> arr[x].first >> arr[x].second;
		hori[arr[x].first]++;
		vert[arr[x].second]++;
	}
	
	int counter=0;
	for(int x=0;x<n;x++){
		int hold=hori[arr[x].first]-1;
		int hold2=vert[arr[x].second]-1;
		counter+=(hold*hold2);
	}
	
	cout << counter;
	
	
}	

int32_t main(){										
	ios::sync_with_stdio(0);	
	cin.tie(0);
	int t=1;
	//cin >> t;
	while(t--){
		solve();
	}
}

		

• Subtask 1: 100 / 100