g1801_1900.s1861_rotating_the_box

Class Solution

java.lang.Object

g1801_1900.s1861_rotating_the_box.Solution

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 '.'.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
char[][]	rotateTheBox(char[][] box)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

rotateTheBox

public char[][] rotateTheBox(char[][] box)