Spiral Order Matrix II

Problem Description

Given an integer A, generate a square matrix filled with elements from 1 to A² in spiral order and return the generated square matrix.

Problem Constraints

1 <= A <= 1000

Input Format

First and only argument is integer A

Output Format

Return a 2-D matrix which consists of the elements added in spiral order.

Example Input

Input 1:

Input 2:

Input 3:

Example Output

Output 1:

[ [1] ]

Output 2:

[ [1, 2], 
  [4, 3] ]

Output 2:

[ [1, 2, 3, 4, 5], 
  [16, 17, 18, 19, 6], 
  [15, 24, 25, 20, 7], 
  [14, 23, 22, 21, 8], 
  [13, 12, 11, 10, 9] ]

Example Explanation

Explanation 1:

Only 1 is to be arranged.

Explanation 2:

1 --> 2
      |
      |
4<--- 3

Explanation 3:

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.

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Spiral Order Matrix II

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