Submission #544763

#	Time	Username	Problem	Language	Result	Execution time	Memory
544763		rainboy	Connect (CEOI06_connect)	C11	100 / 100	36 ms	36712 KiB

connect

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

#define N	12
#define M	39
#define INF	0x3f3f3f3f

int main() {
	static char s[32], aa[N * 2 + 1][M * 2 + 3];
	static int dp[M + 1][N][1 << N][2], bb[M + 1][N][1 << N][2];
	static char cc[M + 1][N][1 << N][2], dd[M + 1][N][1 << N][2];
	int n, m, i, j, b, c;

	fgets(s, 32, stdin), sscanf(s, "%d%d", &n, &m), n /= 2, m /= 2;
	for (i = 0; i <= n * 2; i++)
		fgets(aa[i], m * 2 + 3, stdin);
	memset(dp, 0x3f, sizeof dp);
	dp[0][0][0][0] = 0;
	for (j = 0; j < m; j++)
		for (i = 0; i < n; i++) {
			int (*dp1)[2] = dp[j][i], (*dp2)[2], (*bb2)[2];
			char (*cc2)[2], (*dd2)[2];

			if (i == n - 1)
				dp2 = dp[j + 1][0], bb2 = bb[j + 1][0], cc2 = cc[j + 1][0], dd2 = dd[j + 1][0];
			else
				dp2 = dp[j][i + 1], bb2 = bb[j][i + 1], cc2 = cc[j][i + 1], dd2 = dd[j][i + 1];
			for (b = 0; b < 1 << n; b++)
				for (c = 0; c < 2; c++) {
					int x = dp1[b][c], b_, c_;

					if (x == INF)
						continue;
					if (c == 1) {
						b_ = b & ~(1 << i), c_ = 0;
						if (aa[i * 2 + 1][j * 2 + 1] == ' ')
							if (dp2[b_][c_] > x)
								dp2[b_][c_] = x, bb2[b_][c_] = b, cc2[b_][c_] = c, dd2[b_][c_] = 0;
					} else if (((b & 1 << i) == 0) == (aa[i * 2 + 1][j * 2 + 1] == ' ')) {
						b_ = b & ~(1 << i), c_ = 0;
						if (dp2[b_][c_] > x)
							dp2[b_][c_] = x, bb2[b_][c_] = b, cc2[b_][c_] = c, dd2[b_][c_] = 0;
						if ((b & 1 << i) == 0 && aa[i * 2 + 2][j * 2 + 1] == ' ' && aa[i * 2 + 1][j * 2 + 2] == ' ') {
							b_ = (b | 1 << i) ^ 1 << i + 1, c_ = b >> i + 1 & 1;
							if (dp2[b_][c_] > x + 2)
								dp2[b_][c_] = x + 2, bb2[b_][c_] = b, cc2[b_][c_] = c, dd2[b_][c_] = 3;
						}
					} else {
						if (aa[i * 2 + 2][j * 2 + 1] == ' ') {
							b_ = (b & ~(1 << i)) ^ 1 << i + 1, c_ = b >> i + 1 & 1;
							if (dp2[b_][c_] > x + 1)
								dp2[b_][c_] = x + 1, bb2[b_][c_] = b, cc2[b_][c_] = c, dd2[b_][c_] = 1;
						}
						if (aa[i * 2 + 1][j * 2 + 2] == ' ') {
							b_ = b | 1 << i, c_ = 0;
							if (dp2[b_][c_] > x + 1)
								dp2[b_][c_] = x + 1, bb2[b_][c_] = b, cc2[b_][c_] = c, dd2[b_][c_] = 2;
						}
					}
				}
		}
	j = m, i = 0, b = 0, c = 0;
	while (i > 0 || j > 0) {
		int j_ = i == 0 ? j - 1 : j, i_ = i == 0 ? n - 1 : i - 1, b_ = bb[j][i][b][c], c_ = cc[j][i][b][c];

		if (dd[j][i][b][c] & 1) {
			if (aa[i_ * 2 + 1][j_ * 2 + 1] == ' ')
				aa[i_ * 2 + 1][j_ * 2 + 1] = '.';
			if (aa[i_ * 2 + 2][j_ * 2 + 1] == ' ')
				aa[i_ * 2 + 2][j_ * 2 + 1] = '.';
			if (aa[i_ * 2 + 3][j_ * 2 + 1] == ' ')
				aa[i_ * 2 + 3][j_ * 2 + 1] = '.';
		}
		if (dd[j][i][b][c] & 2) {
			if (aa[i_ * 2 + 1][j_ * 2 + 1] == ' ')
				aa[i_ * 2 + 1][j_ * 2 + 1] = '.';
			if (aa[i_ * 2 + 1][j_ * 2 + 2] == ' ')
				aa[i_ * 2 + 1][j_ * 2 + 2] = '.';
			if (aa[i_ * 2 + 1][j_ * 2 + 3] == ' ')
				aa[i_ * 2 + 1][j_ * 2 + 3] = '.';
		}
		j = j_, i = i_, b = b_, c = c_;
	}
	printf("%d\n", dp[m][0][0][0] * 2);
	for (i = 0; i <= n * 2; i++)
		printf("%s", aa[i]);
	return 0;
}

Compilation message (stderr)

connect.c: In function 'main':
connect.c:44:35: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   44 |        b_ = (b | 1 << i) ^ 1 << i + 1, c_ = b >> i + 1 & 1;
      |                                 ~~^~~
connect.c:44:52: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   44 |        b_ = (b | 1 << i) ^ 1 << i + 1, c_ = b >> i + 1 & 1;
      |                                                  ~~^~~
connect.c:50:38: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   50 |        b_ = (b & ~(1 << i)) ^ 1 << i + 1, c_ = b >> i + 1 & 1;
      |                                    ~~^~~
connect.c:50:55: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   50 |        b_ = (b & ~(1 << i)) ^ 1 << i + 1, c_ = b >> i + 1 & 1;
      |                                                     ~~^~~
connect.c:14:2: warning: ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  fgets(s, 32, stdin), sscanf(s, "%d%d", &n, &m), n /= 2, m /= 2;
      |  ^~~~~~~~~~~~~~~~~~~
connect.c:16:3: warning: ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |   fgets(aa[i], m * 2 + 3, stdin);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100