![\"\"](\"https://assets.leetcode.com/uploads/2021/04/08/rotatingtheboxleetcodewithstones.png\")
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:
'#''*''.'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.
\n\nIt is guaranteed that each stone in boxGrid 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.
\n
Example 1:
\n\n
\nInput: boxGrid = [["#",".","#"]]\nOutput: [["."],\n ["#"],\n ["#"]]\n\n\n
Example 2:
\n\n![\"\"](\"https://assets.leetcode.com/uploads/2021/04/08/rotatingtheboxleetcode2withstones.png\")
\nInput: boxGrid = [["#",".","*","."],\n ["#","#","*","."]]\nOutput: [["#","."],\n ["#","#"],\n ["*","*"],\n [".","."]]\n\n\n
Example 3:
\n\n![\"\"](\"https://assets.leetcode.com/uploads/2021/04/08/rotatingtheboxleetcode3withstone.png\")
\nInput: boxGrid = [["#","#","*",".","*","."],\n ["#","#","#","*",".","."],\n ["#","#","#",".","#","."]]\nOutput: [[".","#","#"],\n [".","#","#"],\n ["#","#","*"],\n ["#","*","."],\n ["#",".","*"],\n ["#",".","."]]\n\n\n
\n
Constraints:
\n\nm == boxGrid.lengthn == boxGrid[i].length1 <= m, n <= 500boxGrid[i][j] is either '#', '*', or '.'.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：
'#' 表示石头'*' 表示固定的障碍物'.' 表示空位置这个箱子被 顺时针旋转 90 度 ，由于重力原因，部分石头的位置会发生改变。每个石头会垂直掉落，直到它遇到障碍物，另一个石头或者箱子的底部。重力 不会 影响障碍物的位置，同时箱子旋转不会产生惯性 ，也就是说石头的水平位置不会发生改变。
\n\n题目保证初始时 boxGrid 中的石头要么在一个障碍物上，要么在另一个石头上，要么在箱子的底部。
请你返回一个 n x m 的矩阵，表示按照上述旋转后，箱子内的结果。
\n\n
示例 1：
\n\n
\n输入：box = [[\"#\",\".\",\"#\"]]\n输出：[[\".\"],\n [\"#\"],\n [\"#\"]]\n\n\n
示例 2：
\n\n
\n输入：box = [[\"#\",\".\",\"*\",\".\"],\n [\"#\",\"#\",\"*\",\".\"]]\n输出：[[\"#\",\".\"],\n [\"#\",\"#\"],\n [\"*\",\"*\"],\n [\".\",\".\"]]\n\n\n
示例 3：
\n\n
\n输入：box = [[\"#\",\"#\",\"*\",\".\",\"*\",\".\"],\n [\"#\",\"#\",\"#\",\"*\",\".\",\".\"],\n [\"#\",\"#\",\"#\",\".\",\"#\",\".\"]]\n输出：[[\".\",\"#\",\"#\"],\n [\".\",\"#\",\"#\"],\n [\"#\",\"#\",\"*\"],\n [\"#\",\"*\",\".\"],\n [\"#\",\".\",\"*\"],\n [\"#\",\".\",\".\"]]\n\n\n
\n\n
提示：
\n\nm == boxGrid.lengthn == boxGrid[i].length1 <= m, n <= 500boxGrid[i][j] 只可能是 '#' ，'*' 或者 '.' 。\\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\"],\"java\":[\"Java\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u88ab\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5305\\u542b Pair \\u7c7b: https:\\/\\/docs.oracle.com\\/javase\\/8\\/javafx\\/api\\/javafx\\/util\\/Pair.html <\\/p>\"],\"python\":[\"Python\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u5e38\\u7528\\u5e93\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8 \\u5bfc\\u5165\\uff0c\\u5982\\uff1aarray<\\/a>, bisect<\\/a>, 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