Package g1801_1900.s1861_rotating_the_box

Class Solution

java.lang.Object
g1801_1900.s1861_rotating_the_box.Solution
public class Solution extends java.lang.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
    Description
    Solution()
     

  • Method Summary

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

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • rotateTheBox

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