Submission #694110

#	Time	Username	Problem	Language	Result	Execution time	Memory
694110		rainboy	Sandwich (JOI16_sandwich)	C11	35 / 100	7074 ms	22164 KiB

sandwich

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

#define N	50
#define M	50
#define INF	0x3f3f3f3f

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

int kk[N + 1][M + 1];

int rect(int i1, int j1, int i2, int j2) {
	return kk[i2][j2] - kk[i2][j1] - kk[i1][j2] + kk[i1][j1];
}

int main() {
	static char cc[N][M + 1];
	static int nzl[N][M], nzr[N][M], znl[N][M], znr[N][M], nzu[N][M], nzd[N][M], znu[N][M], znd[N][M], dp[N + 1][M + 1][N + 1][M + 1], ans[N][M];
	int n, m, i, i1, i2, j, j1, j2;

	scanf("%d%d", &n, &m);
	for (i = 0; i < n; i++)
		scanf("%s", cc[i]);
	for (i = 0; i < n; i++)
		memset(ans[i], 0x3f, m * sizeof *ans[i]);
	for (i = 0; i < n; i++) {
		nzl[i][0] = -1;
		for (j = 1; j < m; j++)
			nzl[i][j] = cc[i][j - 1] == 'N' && cc[i][j] == 'Z' ? j - 1 : nzl[i][j - 1];
		nzr[i][m - 1] = m;
		for (j = m - 2; j >= 0; j--)
			nzr[i][j] = cc[i][j] == 'N' && cc[i][j + 1] == 'Z' ? j + 1 : nzr[i][j + 1];
		znl[i][0] = -1;
		for (j = 1; j < m; j++)
			znl[i][j] = cc[i][j - 1] == 'Z' && cc[i][j] == 'N' ? j - 1 : znl[i][j - 1];
		znr[i][m - 1] = m;
		for (j = m - 2; j >= 0; j--)
			znr[i][j] = cc[i][j] == 'Z' && cc[i][j + 1] == 'N' ? j + 1 : znr[i][j + 1];
	}
	for (j = 0; j < m; j++) {
		nzu[0][j] = -1;
		for (i = 1; i < n; i++)
			nzu[i][j] = cc[i - 1][j] == 'N' && cc[i][j] == 'Z' ? i - 1 : nzu[i - 1][j];
		nzd[n - 1][j] = n;
		for (i = n - 2; i >= 0; i--)
			nzd[i][j] = cc[i][j] == 'N' && cc[i + 1][j] == 'Z' ? i + 1 : nzd[i + 1][j];
		znu[0][j] = -1;
		for (i = 1; i < n; i++)
			znu[i][j] = cc[i - 1][j] == 'Z' && cc[i][j] == 'N' ? i - 1 : znu[i - 1][j];
		znd[n - 1][j] = n;
		for (i = n - 2; i >= 0; i--)
			znd[i][j] = cc[i][j] == 'Z' && cc[i + 1][j] == 'N' ? i + 1 : znd[i + 1][j];
	}
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++)
			kk[i + 1][j + 1] = cc[i][j] == 'N' ? 0 : 1;
	for (i = 1; i <= n; i++)
		for (j = 1; j <= m; j++)
			kk[i][j] += kk[i][j - 1];
	for (i = 1; i <= n; i++)
		for (j = 1; j <= m; j++)
			kk[i][j] += kk[i - 1][j];
	for (i1 = 0; i1 <= n; i1++)
		for (j1 = 0; j1 <= m; j1++)
			for (i2 = n; i2 >= i1; i2--)
				memset(dp[i1][j1][i2], 0x3f, (m + 1) * sizeof *dp[i1][j1][i2]);
	dp[0][0][n][m] = 0;
	for (i1 = 0; i1 <= n; i1++)
		for (j1 = 0; j1 <= m; j1++)
			for (i2 = n; i2 >= i1; i2--)
				for (j2 = m; j2 >= j1; j2--) {
					int x = dp[i1][j1][i2][j2];

					if (x == INF)
						continue;
					if (i1 + 1 < i2 && nzr[i1][j1] > j2 - 1)
						dp[i1 + 1][j1][i2][j2] = min(dp[i1 + 1][j1][i2][j2], x + (j2 - j1));
					if (i2 - 1 > i1 && znr[i2 - 1][j1] > j2 - 1)
						dp[i1][j1][i2 - 1][j2] = min(dp[i1][j1][i2 - 1][j2], x + (j2 - j1));
					if (j1 + 1 < j2 && nzd[i1][j1] > i2 - 1)
						dp[i1][j1 + 1][i2][j2] = min(dp[i1][j1 + 1][i2][j2], x + (i2 - i1));
					if (j2 - 1 > j1 && znd[i1][j2 - 1] > i2 - 1)
						dp[i1][j1][i2][j2 - 1] = min(dp[i1][j1][i2][j2 - 1], x + (i2 - i1));
					for (i = i1; i <= i2; i++)
						for (j = j1; j <= j2; j++) {
							int ul = rect(i1, j1, i, j) == (i - i1) * (j - j1);
							int ur = rect(i1, j, i, j2) == 0;
							int dl = rect(i, j1, i2, j) == 0;
							int dr = rect(i, j, i2, j2) == (i2 - i) * (j2 - j);

							if (ul && i1 < i && j1 < j)
								ans[i - 1][j - 1] = min(ans[i - 1][j - 1], (x + (i - i1) * (j - j1)) * 2);
							if (ur && i1 < i && j < j2)
								ans[i - 1][j] = min(ans[i - 1][j], (x + (i - i1) * (j2 - j)) * 2);
							if (dl && i < i2 && j1 < j)
								ans[i][j - 1] = min(ans[i][j - 1], (x + (i2 - i) * (j - j1)) * 2);
							if (dr && i < i2 && j < j2)
								ans[i][j] = min(ans[i][j], (x + (i2 - i) * (j2 - j)) * 2);
							if (ul && dr) {
								dp[i1][j][i][j2] = min(dp[i1][j][i][j2], x + (i - i1) * (j - j1) + (i2 - i) * (j2 - j));
								dp[i][j1][i2][j] = min(dp[i][j1][i2][j], x + (i - i1) * (j - j1) + (i2 - i) * (j2 - j));
							}
							if (ur && dl) {
								dp[i1][j1][i][j] = min(dp[i1][j1][i][j], x + (i - i1) * (j2 - j) + (i2 - i) * (j - j1));
								dp[i][j][i2][j2] = min(dp[i][j][i2][j2], x + (i - i1) * (j2 - j) + (i2 - i) * (j - j1));
							}
						}
				}
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++)
			printf("%d%c", ans[i][j] == INF ? -1 : ans[i][j], j + 1 < m ? ' ' : '\n');
	return 0;
}

Compilation message (stderr)

sandwich.c: In function 'main':
sandwich.c:21:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
sandwich.c:23:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |   scanf("%s", cc[i]);
      |   ^~~~~~~~~~~~~~~~~~

• Subtask 1: 35 / 35
• Subtask 2: 0 / 65