#323 Spiral Matrix

medium

javascript

blind75

matrix

Given an m x n matrix, return all elements in spiral order (clockwise from outside to inside).

Rules:

Start from top-left corner
Move in clockwise direction
Visit each element exactly once
Return elements in order visited

Constraints:

1 ≤ matrix.length, matrix[i].length ≤ 10
-100 ≤ matrix[i][j] ≤ 100

Examples:

// Example 1: 2x2 matrix
console.log(
  spiralOrder([
    [1, 2],
    [3, 4],
  ]),
);
// Output: [1,2,4,3]

// Example 2: 3x3 matrix
console.log(
  spiralOrder([
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
  ]),
);
// Output: [1,2,3,6,9,8,7,4,5]

// Example 3: 3x4 matrix
console.log(
  spiralOrder([
    [1, 2, 3, 4],
    [5, 6, 7, 8],
    [9, 10, 11, 12],
  ]),
);
// Output: [1,2,3,4,8,12,11,10,9,5,6,7]