You are given a 2D matrix grid of size n x n. Initially, all cells of the grid are colored white. In one operation, you can select any cell of indices (i, j), and color black all the cells of the jth column starting from the top row down to the ith row. The…

给你一个 m x n 的网格 grid，其中每个单元格包含以下值之一：0、1 或 2。另给你一个整数 k。

You are given an m x n grid where each cell contains one of the values 0, 1, or 2. You are also given an integer k. You start from the top-left corner (0, 0) and want to reach the bottom-right corner (m - 1, n - 1) by moving only right or down. Each cell…

给定一个 n × n 的二维矩阵 matrix 表示一个图像。请你将图像顺时针旋转 90 度。 你必须在 原地 旋转图像，这意味着你需要直接修改输入的二维矩阵。请不要 使用另一个矩阵来旋转图像。   示例 1： 输入：matrix = [[1,2,3],[4,5,6],[7,8,9]] 输出：[[7,4,1],[8,5,2],[9,6,3]] 示例 2： 输入：matrix = [[5,1,9,11],[2,4,8,10],[13,3,6,7],[15,14,12,16]] 输出：[[15,13,2,5]…

You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise). You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. DO NOT allocate another 2D matrix and do the rotation.…

给你一个 m x n 的字符矩阵 boxGrid ，它表示一个箱子的侧视图。箱子的每一个格子可能为：

You are given an m x n matrix of characters boxGrid representing a side-view of a box. Each cell of the box is one of the following:

给你一个大小为 m x n 的整数矩阵 grid​​​ ，其中 m 和 n 都是 偶数 ；另给你一个整数 k 。 矩阵由若干层组成，如下图所示，每种颜色代表一层： 矩阵的循环轮转是通过分别循环轮转矩阵中的每一层完成的。在对某一层进行一次循环旋转操作时，层中的每一个元素将会取代其 逆时针 方向的相邻元素。轮转示例如下： 返回执行 k 次循环轮转操作后的矩阵。   示例 1： 输入：grid = [[40,10],[30,20]], k = 1 输出：[[10,20],[40,30]] 解释：上图展示了矩阵…

You are given an m x n integer matrix grid​​​, where m and n are both even integers, and an integer k. The matrix is composed of several layers, which is shown in the below image, where each color is its own layer: A cyclic rotation of the matrix is done…

给你一个下标从 0 开始、大小为 n x n 的二维矩阵 grid ，其中 (r, c) 表示：