# 1861. Rotating the Box """ 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 '', or 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. return an 'm x n' matrix representing the box after the rotation. """ class Solution(object): def rotateTheBox(self, box): """ :type box: List[List[str]] :rtype: List[List[str]] """ for row in box: mov_pos = len(row) - 1 for j in range(len(row) - 1, -1, -1): if row[j] == "*": mov_pos = j - 1 elif row[j] == "#": row[mov_pos], row[j] = row[j], row[mov_pos] mov_pos -= 1 return zip(*box[::-1]) if __name__ == "__main__": obj = Solution() print(obj.rotateTheBox(box=[["#", ".", "#"]])) print(obj.rotateTheBox(box=[["#", ".", "*", "."], ["#", "#", "*", "."]])) print( obj.rotateTheBox( box=[ ["#", "#", "*", ".", "*", "."], ["#", "#", "#", "*", ".", "."], ["#", "#", "#", ".", "#", "."], ] ) )