int[][] grid =new int[][]{{1, 2, 3}, {4, 5, 6}}; System.out.println(grid.length +" " + grid[0].length +" " + grid[1][2]);
int[][] grid =new int[][]{{1, 2, 3}, {4, 5, 6}};
System.out.println(grid.length +" " + grid[0].length +" " + grid[1][2]);
输出：
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