Submission #392825

#	Time	Username	Problem	Language	Result	Execution time	Memory
392825		rainboy	Studentsko (COCI14_studentsko)	C11	100 / 100	2 ms	372 KiB

studentsko

#include <stdio.h>

#define N	5000

int max(int a, int b) { return a > b ? a : b; }

unsigned int X = 12345;

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

int aa[N];

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

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

int ft[N];

void update(int i, int n, int x) {
	while (i < n) {
		ft[i] = max(ft[i], x);
		i |= i + 1;
	}
}

int query(int i) {
	int x = 0;

	while (i >= 0) {
		x = max(x, ft[i]);
		i &= i + 1, i--;
	}
	return x;
}

int main() {
	static int ii[N];
	int n, m, k, i;

	scanf("%d%d", &n, &k), m = n / k;
	for (i = 0; i < n; i++) {
		scanf("%d", &aa[i]);
		ii[i] = i;
	}
	sort(ii, 0, n);
	for (i = 0; i < n; i++)
		aa[ii[i]] = i / k;
	for (i = 0; i < n; i++)
		update(aa[i], m, query(aa[i]) + 1);
	printf("%d\n", n - query(m - 1));
	return 0;
}

Compilation message (stderr)

studentsko.c: In function 'main':
studentsko.c:57:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   57 |  scanf("%d%d", &n, &k), m = n / k;
      |  ^~~~~~~~~~~~~~~~~~~~~
studentsko.c:59:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   59 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10