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力扣每日一题矩阵中移动的最大次数 DP

article 2025/3/7 10:03:51

Problem: 2684. 矩阵中移动的最大次数

复杂度

⏰ 时间复杂度: $O (nm)$

🌎 空间复杂度: $O (nm)$

Code

class Solution {
public int maxMoves(int[][] grid)
	{
		int n = grid.length;
		int m = grid[0].length;
		int[][] f = new int[n][m];
		int max = -1;
		for (int j = 1; j < m; j++)
		{
			for (int i = 0; i < n; i++)
			{
				if (grid[i][j] > grid[i][j - 1] && f[i][j - 1] == j - 1)
					f[i][j] = f[i][j - 1] + 1;
				if (i - 1 >= 0 && grid[i][j] > grid[i - 1][j - 1] && f[i - 1][j - 1] == j - 1)
					f[i][j] = Math.max(f[i][j], f[i - 1][j - 1] + 1);
				if (i + 1 < n && grid[i][j] > grid[i + 1][j - 1] && f[i + 1][j - 1] == j - 1)
					f[i][j] = Math.max(f[i][j], f[i + 1][j - 1] + 1);
				max = max > f[i][j] ? max : f[i][j];
			}
		}
		return max;
	}
}

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