[LeetCode] 1861. Rotating the Box

 Problem : https://leetcode.com/problems/rotating-the-box/

This problem is similar to removing zeros from the input array.

class Solution:
    def rotateTheBox(self, box: List[List[str]]) -> List[List[str]]:
        
        ROW = len(box)
        COLUMN = len(box[0])
        
        for y in range(ROW):
            i = COLUMN - 1
            for x in reversed(range(COLUMN)):
                if box[y][x] == '#':
                    box[y][i] = box[y][x]
                    i -= 1
                elif box[y][x] == '*':
                
                	# set positions between the last empty and the obstacle as empty spaces.
                    while i > x:
                        box[y][i] = '.'
                        i -= 1
                    
                    while i >= 0 and box[y][i] == '*':
                        i -= 1
            
            # set the rest positions as empty spaces
            while i >= 0:
                box[y][i] = '.'
                i -= 1
        
        # rotate the board 90 degrees clockwise
        result = [[''] * ROW for _ in range(COLUMN)]
        
        for y in range(ROW):
            for x in range(COLUMN):
                result[x][ROW-y-1]= box[y][x]
        
        return result