Submission #547819

#	Time	Username	Problem	Language	Result	Execution time	Memory
547819		racsosabe	Star triangles (IZhO11_triangle)	C++14	100 / 100	309 ms	13344 KiB

triangle

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

int n;
map<int, int> X;
map<int, int> Y;

int main(){
	scanf("%d", &n);
	vector<pair<int, int>> v;
	for(int i = 0; i < n; i++){
		int x, y;
		scanf("%d %d", &x, &y);
		X[x]++;
		Y[y]++;
		v.emplace_back(make_pair(x, y));
	}
	long long ans = 0;
	for(auto e : v){
		ans += 1ll * (X[e.first] - 1) * (Y[e.second] - 1);
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:9:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
triangle.cpp:13:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |   scanf("%d %d", &x, &y);
      |   ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100