public class Solution
extends Object
1861 - Rotating the Box\.
Medium
You are given an `m x n` matrix of characters `box` representing a side-view of a box. Each cell of the box is one of the following:
* A stone `'#'`
* A stationary obstacle `'*'`
* Empty `'.'`
The box is rotated **90 degrees clockwise** , causing some of the stones to fall due to gravity. Each stone falls down until it lands on an obstacle, another stone, or the bottom of the box. Gravity **does not** affect the obstacles' positions, and the inertia from the box's rotation **does not** affect the stones' horizontal positions.
It is **guaranteed** that each stone in `box` rests on an obstacle, another stone, or the bottom of the box.
Return _an_ `n x m` _matrix representing the box after the rotation described above_.
**Example 1:**
**Input:**
box = \[\["#",".","#"]]
**Output:**
[["."],
["#"],
["#"]]
**Example 2:**
**Input:**
box = \[\["#",".","*","."],
["#","#","*","."]]
**Output:**
[["#","."],
["#","#"],
["*","*"],
[".","."]]
**Example 3:**
**Input:**
box = \[\["#","#","*",".","*","."],
["#","#","#","*",".","."],
["#","#","#",".","#","."]]
**Output:**
[[".","#","#"],
[".","#","#"],
["#","#","*"],
["#","*","."],
["#",".","*"],
["#",".","."]]
**Constraints:**
* `m == box.length`
* `n == box[i].length`
* `1 <= m, n <= 500`
* `box[i][j]` is either `'#'`, `'*'`, or `'.'`.