Submission #767358

#	Time	Username	Problem	Language	Result	Execution time	Memory
767358		rainboy	K blocks (IZhO14_blocks)	C11	100 / 100	110 ms	2544 KiB

blocks

#include <stdio.h>
#include <string.h>

#define N	100000
#define INF	0x3f3f3f3f

int min(int a, int b) { return a < b ? a : b; }

int main() {
	static int aa[N], dp[N + 1], dp_[N + 1], dq[N + 1], dr[N + 1], qu[N + 1];
	int n, cnt, k, i, q;

	scanf("%d%d", &n, &k);
	for (i = 0; i < n; i++)
		scanf("%d", &aa[i]);
	memset(dp, 0x3f, (n + 1) * sizeof *dp), dp[0] = 0;
	while (k--) {
		cnt = 0;
		dp_[0] = INF;
		for (i = 0; i < n; i++) {
			q = dp[i];
			while (cnt && aa[qu[cnt - 1]] <= aa[i])
				q = min(q, dq[--cnt]);
			qu[cnt] = i, dq[cnt] = q, dr[cnt] = min(cnt == 0 ? INF : dr[cnt - 1], q + aa[i]), cnt++;
			dp_[i + 1] = dr[cnt - 1];
		}
		memcpy(dp, dp_, (n + 1) * sizeof *dp_);
	}
	printf("%d\n", dp[n]);
	return 0;
}

Compilation message (stderr)

blocks.c: In function 'main':
blocks.c:13:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  scanf("%d%d", &n, &k);
      |  ^~~~~~~~~~~~~~~~~~~~~
blocks.c:15:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 18 / 18
• Subtask 3: 21 / 21
• Subtask 4: 47 / 47