Submission #888004

#	Time	Username	Problem	Language	Result	Execution time	Memory
888004		Hovhannes1234	Star triangles (IZhO11_triangle)	C++17	100 / 100	374 ms	9916 KiB

triangle

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

int main() {
	int n;
	cin>>n;
	map <long long, long long> mpx,mpy;
	vector <pair<int,int>> vec;
	for(int i=1; i<=n; i++){
		long long x,y;
		cin>>x>>y;
		vec.push_back({x,y});
		mpx[x]++;
		mpy[y]++;
	}
	long long ans=0;
	for(int i=0; i<vec.size(); i++){
		ans+=(mpx[vec[i].first]-1) * (mpy[vec[i].second]-1);
	}
	cout<<ans<<endl;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:17:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |  for(int i=0; i<vec.size(); i++){
      |               ~^~~~~~~~~~~

• Subtask 1: 100 / 100