Submission #330924

#	Time	Username	Problem	Language	Result	Execution time	Memory
330924		ZwariowanyMarcin	별들과 삼각형 (IZhO11_triangle)	C++14	100 / 100	397 ms	10092 KiB

triangle

#include <bits/stdc++.h>
#define pb push_back
#define fi first
#define se second
#define sz(x) (int)x.size()

using ll = long long;
using namespace std;

const int N = 1 << 20;

int n, x[N], y[N];
ll res;		
map<int, int> dx, dy;

int main() {
	scanf("%d", &n);
	for (int i = 0; i < n; ++i) {
		scanf("%d%d", x + i, y + i);
		dx[x[i]]++;
		dy[y[i]]++;
	}
	for (int i = 0; i < n; ++i)
		res += 1LL * (dx[x[i]] - 1) * (dy[y[i]] - 1);
	printf("%lld\n", res);
	return 0;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:17:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
triangle.cpp:19:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |   scanf("%d%d", x + i, y + i);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100