Submission #49338

#	Time	Username	Problem	Language	Result	Execution time	Memory
49338		WLZ	Circle selection (APIO18_circle_selection)	C++17	7 / 100	3043 ms	8612 KiB

circle_selection

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

int n;
struct circle {
    int x, y, r, id;
			 
    circle() {
		x = y = r = id = 0;
	}
} arr[300005];
int ans[300005];

bool comp(const circle& a, const circle& b) {
	if (a.r == b.r) return a.id < b.id;
	return a.r > b.r;
}

bool inter(const circle& a, const circle& b) {
    long long dist = (a.x - b.x) * 1ll * (a.x - b.x) + (a.y - b.y) * 1ll * (a.y - b.y);
	return dist <= (a.r + b.r) * 1ll * (a.r + b.r);
}

int main() {
	scanf("%d", &n);
	for (int i = 1; i <= n; i++) {
		scanf("%d %d %d", &arr[i].x, &arr[i].y, &arr[i].r);
		arr[i].id = i;
	}
	sort(arr + 1, arr + 1 + n, comp);
	for (int i = 1; i <= n; i++) ans[i] = i;
	for (int i = 1; i <= n; i++) {
		if (ans[arr[i].id] != arr[i].id) {
			continue;
		}
		for (int j = i + 1; j <= n; j++) {
			if (ans[arr[j].id] == arr[j].id) {
				if (inter(arr[i], arr[j])) {
					ans[arr[j].id] = arr[i].id;
				}
			}
		}
	}
	for (int i = 1; i <= n; i++) printf("%d ", ans[i]);
	return 0;
}

Compilation message (stderr)

circle_selection.cpp: In function 'int main()':
circle_selection.cpp:25:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
circle_selection.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d", &arr[i].x, &arr[i].y, &arr[i].r);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 12
• Subtask 3: 0 / 15
• Subtask 4: 0 / 23
• Subtask 5: 0 / 30
• Subtask 6: 0 / 13