Submission #727918

#	Time	Username	Problem	Language	Result	Execution time	Memory
727918		rainboy	Orchard (NOI14_orchard)	C11	25 / 25	173 ms	6108 KiB

orchard

#include <stdio.h>

#define NM	1000000

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

int main() {
	static int aa[NM];
	int n, m, i, i1, i2, j, k, sum, ans;

	scanf("%d%d", &n, &m);
	k = 0;
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++) {
			int a;

			scanf("%d", &a);
			if (a == 1)
				aa[i * m + j] = -1, k++;
			else
				aa[i * m + j] = 1;
		}
	for (j = 0; j < m; j++)
		for (i = 1; i < n; i++)
			aa[i * m + j] += aa[(i - 1) * m + j];
	ans = n * m;
	for (i1 = 0; i1 < n; i1++)
		for (i2 = i1; i2 < n; i2++) {
			sum = 0;
			for (j = 0; j < m; j++) {
				sum = min(sum + aa[i2 * m + j] - (i1 == 0 ? 0 : aa[(i1 - 1) * m + j]), 0);
				ans = min(ans, k + sum);
			}
		}
	printf("%d\n", ans);
	return 0;
}

Compilation message (stderr)

orchard.c: In function 'main':
orchard.c:11:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
orchard.c:17:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |    scanf("%d", &a);
      |    ^~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 5 / 5
• Subtask 4: 3 / 3
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5