Submission #478266

#	Time	Username	Problem	Language	Result	Execution time	Memory
478266		rainboy	Sajam (COCI18_sajam)	C11	90 / 90	230 ms	6420 KiB

sajam

#include <stdio.h>

#define N	1000
#define K	50
#define L	20

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

int cnt[1 << L];

void init() {
	int b;

	for (b = 1; b < 1 << L; b++)
		cnt[b] = cnt[b & b - 1] + 1;
}

int dist(int *aa, int *bb) {
	int h, d;

	d = 0;
	for (h = 0; h < K; h++)
		d += cnt[aa[h] ^ bb[h]];
	return d;
}

int main() {
	static char cc[N][N + 1];
	static int aa[N][K];
	int n, k_, i, i_, j;

	init();
	scanf("%d%d", &n, &k_);
	for (i = 0; i < n; i++) {
		scanf("%s", cc[i]);
		for (j = 0; j < n; j++)
			if (cc[i][j] == 'o')
				aa[i][j / L] |= 1 << j % L;
	}
	for (i = 0; i < n; i++) {
		int k;

		k = 0;
		for (i_ = 0; i_ < n; i_++) {
			int d = dist(aa[i], aa[i_]);

			k += min(d, n - d);
		}
		if (k <= k_) {
			printf("DA\n");
			return 0;
		}
	}
	for (j = 0; j < n; j++) {
		int k;

		aa[0][j / L] ^= 1 << j % L;
		k = 0;
		for (i = 0; i < n; i++) {
			int d = dist(aa[0], aa[i]);

			k += min(d, n - d);
		}
		if (k <= k_) {
			printf("DA\n");
			return 0;
		}
		aa[0][j / L] ^= 1 << j % L;
	}
	printf("NE\n");
	return 0;
}

Compilation message (stderr)

sajam.c: In function 'init':
sajam.c:15:22: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   15 |   cnt[b] = cnt[b & b - 1] + 1;
      |                    ~~^~~
sajam.c: In function 'main':
sajam.c:33:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |  scanf("%d%d", &n, &k_);
      |  ^~~~~~~~~~~~~~~~~~~~~~
sajam.c:35:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |   scanf("%s", cc[i]);
      |   ^~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
• Subtask 6: 15 / 15