Submission #544779

#	Time	Username	Problem	Language	Result	Execution time	Memory
544779		rainboy	A Huge Tower (CEOI10_tower)	C11	100 / 100	160 ms	8776 KiB

tower

#include <stdio.h>
#include <stdlib.h>

#define MD	1000000009

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

void sort(int *aa, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, a = aa[l + rand_() % (r - l)], tmp;

		while (j < k)
			if (aa[j] == a)
				j++;
			else if (aa[j] < a) {
				tmp = aa[i], aa[i] = aa[j], aa[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = aa[j], aa[j] = aa[k], aa[k] = tmp;
			}
		sort(aa, l, i);
		l = k;
	}
}

int main() {
	int *aa, n, d, i, j, ans;

	scanf("%d%d", &n, &d);
	aa = (int *) malloc(n * sizeof *aa);
	for (i = 0; i < n; i++)
		scanf("%d", &aa[i]);
	sort(aa, 0, n);
	ans = 1;
	for (i = 0, j = 0; j < n; j++) {
		while (i < n && aa[i] + d < aa[j])
			i++;
		ans = (long long) ans * (j - i + 1) % MD;
	}
	printf("%d\n", ans);
	return 0;
}

Compilation message (stderr)

tower.c: In function 'main':
tower.c:34:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |  scanf("%d%d", &n, &d);
      |  ^~~~~~~~~~~~~~~~~~~~~
tower.c:37:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
• Subtask 8: 5 / 5
• Subtask 9: 5 / 5
• Subtask 10: 5 / 5
• Subtask 11: 5 / 5
• Subtask 12: 5 / 5
• Subtask 13: 5 / 5
• Subtask 14: 5 / 5
• Subtask 15: 5 / 5
• Subtask 16: 5 / 5
• Subtask 17: 5 / 5
• Subtask 18: 5 / 5
• Subtask 19: 5 / 5
• Subtask 20: 5 / 5