Submission #705527

#	Time	Username	Problem	Language	Result	Execution time	Memory
705527		rainboy	Stove (JOI18_stove)	C11	100 / 100	25 ms	1616 KiB

stove

#include <stdio.h>

#define N	100000

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, k, i, ans;

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

Compilation message (stderr)

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

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50