2411. Spiral Matrix IV

Medium
Array
Linked List
Matrix
Simulation

Description

You are given two integers m and n, which represent the dimensions of a matrix.

You are also given the head of a linked list of integers.

Generate an m x n matrix that contains the integers in the linked list presented in spiral order (clockwise), starting from the top-left of the matrix. If there are remaining empty spaces, fill them with -1.

Return the generated matrix.

 

Example 1:

Input: m = 3, n = 5, head = [3,0,2,6,8,1,7,9,4,2,5,5,0]
Output: [[3,0,2,6,8],[5,0,-1,-1,1],[5,2,4,9,7]]
Explanation: The diagram above shows how the values are printed in the matrix.
Note that the remaining spaces in the matrix are filled with -1.

Example 2:

Input: m = 1, n = 4, head = [0,1,2]
Output: [[0,1,2,-1]]
Explanation: The diagram above shows how the values are printed from left to right in the matrix.
The last space in the matrix is set to -1.

 

Constraints:

  • 1 <= m, n <= 105
  • 1 <= m * n <= 105
  • The number of nodes in the list is in the range [1, m * n].
  • 0 <= Node.val <= 1000

Hints

Hint 1
First, generate an m x n matrix filled with -1s.
Hint 2
Navigate within the matrix at (i, j) with the help of a direction vector ⟨di, dj⟩. At (i, j), you need to decide if you can keep going in the current direction.
Hint 3
If you cannot keep going, rotate the direction vector clockwise by 90 degrees.

Statistics

Acceptance
82.3%
Submissions
217,771
Accepted
179,199