Question

2326. Spiral Matrix IV

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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

Solutions

Solution 1

# Definition for singly-linked list.
# class ListNode:
#   def __init__(self, val=0, next=None):
#     self.val = val
#     self.next = next
class Solution:
  def spiralMatrix(self, m: int, n: int, head: Optional[ListNode]) -> List[List[int]]:
    ans = [[-1] * n for _ in range(m)]
    i = j = p = 0
    dirs = [[0, 1], [1, 0], [0, -1], [-1, 0]]
    while 1:
      ans[i][j] = head.val
      head = head.next
      if not head:
        break
      while 1:
        x, y = i + dirs[p][0], j + dirs[p][1]
        if x < 0 or y < 0 or x >= m or y >= n or ~ans[x][y]:
          p = (p + 1) % 4
        else:
          i, j = x, y
          break
    return ans

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *   int val;
 *   ListNode next;
 *   ListNode() {}
 *   ListNode(int val) { this.val = val; }
 *   ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
  public int[][] spiralMatrix(int m, int n, ListNode head) {
    int[][] ans = new int[m][n];
    for (int[] row : ans) {
      Arrays.fill(row, -1);
    }
    int i = 0, j = 0, p = 0;
    int[][] dirs = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};
    while (true) {
      ans[i][j] = head.val;
      head = head.next;
      if (head == null) {
        break;
      }
      while (true) {
        int x = i + dirs[p][0], y = j + dirs[p][1];
        if (x < 0 || y < 0 || x >= m || y >= n || ans[x][y] >= 0) {
          p = (p + 1) % 4;
        } else {
          i = x;
          j = y;
          break;
        }
      }
    }
    return ans;
  }
}

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *   int val;
 *   ListNode *next;
 *   ListNode() : val(0), next(nullptr) {}
 *   ListNode(int x) : val(x), next(nullptr) {}
 *   ListNode(int x, ListNode *next) : val(x), next(next) {}
 * };
 */
class Solution {
public:
  vector<vector<int>> spiralMatrix(int m, int n, ListNode* head) {
    vector<vector<int>> ans(m, vector<int>(n, -1));
    int i = 0, j = 0, p = 0;
    vector<vector<int>> dirs = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};
    while (1) {
      ans[i][j] = head->val;
      head = head->next;
      if (!head) break;
      while (1) {
        int x = i + dirs[p][0], y = j + dirs[p][1];
        if (x < 0 || y < 0 || x >= m || y >= n || ans[x][y] >= 0)
          p = (p + 1) % 4;
        else {
          i = x, j = y;
          break;
        }
      }
    }
    return ans;
  }
};

/**
 * Definition for singly-linked list.
 * type ListNode struct {
 *   Val int
 *   Next *ListNode
 * }
 */
func spiralMatrix(m int, n int, head *ListNode) [][]int {
  ans := make([][]int, m)
  for i := range ans {
    ans[i] = make([]int, n)
    for j := range ans[i] {
      ans[i][j] = -1
    }
  }
  i, j, p := 0, 0, 0
  dirs := [][]int{{0, 1}, {1, 0}, {0, -1}, {-1, 0}}
  for {
    ans[i][j] = head.Val
    head = head.Next
    if head == nil {
      break
    }
    for {
      x, y := i+dirs[p][0], j+dirs[p][1]
      if x < 0 || y < 0 || x >= m || y >= n || ans[x][y] >= 0 {
        p = (p + 1) % 4
      } else {
        i, j = x, y
        break
      }
    }
  }
  return ans
}

/**
 * Definition for singly-linked list.
 * class ListNode {
 *   val: number
 *   next: ListNode | null
 *   constructor(val?: number, next?: ListNode | null) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.next = (next===undefined ? null : next)
 *   }
 * }
 */

function spiralMatrix(m: number, n: number, head: ListNode | null): number[][] {
  const dirs = [
    [0, 1],
    [1, 0],
    [0, -1],
    [-1, 0],
  ];
  let ans = Array.from({ length: m }, v => new Array(n).fill(-1));
  let i = 0,
    j = 0,
    k = 0;
  while (head) {
    ans[i][j] = head.val;
    head = head.next;
    let x = i + dirs[k][0];
    let y = j + dirs[k][1];
    if (x < 0 || x > m - 1 || y < 0 || y > n - 1 || ans[x][y] != -1) {
      k = (k + 1) % 4;
    }
    i = i + dirs[k][0];
    j = j + dirs[k][1];
  }
  return ans;
}