제출 #46965

#제출 시각아이디문제언어결과실행 시간메모리
46965robertStar triangles (IZhO11_triangle)C++14
100 / 100
568 ms38900 KiB
#include <cstdio>
#include <map>

using namespace std;

int main(){
	int N; scanf("%d", &N);
	int x[300100], y[300100];
	map<int, int> ctx, cty;
	for(int n=0; n<N; n++){
		scanf("%d %d", &x[n], &y[n]);
		ctx[x[n]]++;
		cty[y[n]]++;
	}
	long long ans = 0;
	for(int n=0; n<N; n++){
		ans += (ctx[x[n]]-1)*(cty[y[n]]-1);
	}
	printf("%lld\n", ans);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

triangle.cpp: In function 'int main()':
triangle.cpp:7:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int N; scanf("%d", &N);
         ~~~~~^~~~~~~~~~
triangle.cpp:11:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &x[n], &y[n]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
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