Submission #5879

#	Time	Username	Problem	Language	Result	Execution time	Memory
5879		kriii	Star triangles (IZhO11_triangle)	C++98	100 / 100	532 ms	7644 KiB

triangle

#include <stdio.h>
#include <map>
using namespace std;

map<int, long long> X,Y;
int x[300003],y[300003];

int main()
{
	int N;

	scanf ("%d",&N);
	for (int i=0;i<N;i++){
		scanf ("%d %d",&x[i],&y[i]);
		X[x[i]]++; Y[y[i]]++;
	}

	long long ans = 0;
	for (int i=0;i<N;i++) ans += (X[x[i]] - 1) * (Y[y[i]] - 1);
	printf ("%lld\n",ans);

	return 0;
}

• Subtask 1: 100 / 100