Fill a Special Grid
You are given a non-negative integer n representing a 2n x 2n grid.
You are given a non-negative integer n representing a 2n x 2n grid. You must fill the grid with integers from 0 to 22n - 1 to make it special. A grid is special if it satisfies all the following conditions:
Return the special 2n x 2n grid.
Note: Any 1x1 grid is special.
Example 1
Input: n = 0
Output: [[0]]
Explanation: The only number that can be placed is 0, and there is only one possible position in the grid.
Example 2
Input: n = 1
Output: [[3,0],[2,1]]
Explanation: The numbers in each quadrant are: Since 0 < 1 < 2 < 3 , this satisfies the given constraints.
Example 3
Input: n = 2
Output: [[15,12,3,0],[14,13,2,1],[11,8,7,4],[10,9,6,5]]
Explanation: The numbers in each quadrant are: This satisfies the first three requirements. Additionally, each quadrant is also a special grid. Thus, this is a special grid.
Constraints
- 0 <= n <= 10
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