Submission #463796

#	Time	Username	Problem	Language	Result	Execution time	Memory
463796		rainboy	Hindeks (COCI17_hindeks)	C11	50 / 50	138 ms	5440 KiB

hindeks

#include <stdio.h>

#define N	500000

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() {
	static int aa[N];
	int n, h, i;

	scanf("%d", &n);
	for (i = 0; i < n; i++)
		scanf("%d", &aa[i]);
	sort(aa, 0, n);
	h = 0;
	while (h < n && aa[h] >= h + 1)
		h++;
	printf("%d\n", h);
	return 0;
}

Compilation message (stderr)

hindeks.c: In function 'main':
hindeks.c:34:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
hindeks.c:36:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~

• Subtask 1: 50 / 50