문제
풀이
#include <cmath>
#include <iostream>
using namespace std;
void solve(void) {
int n, k, x, y; cin >> n >> k >> x >> y;
int ans = 0;
while (n--) {
int a, b; cin >> a >> b;
if (hypot(a-x, b-y) > k) ans++;
}
cout << ans;
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
solve();
return 0;
}