Web Reference: Can you determine an efficient way to implement this? Each boundary consists of four parts: the top row, right column, bottom row, and left column, which follow the spiral order and act as four pointers. Spiral Matrix - Given an m x n matrix, return all elements of the matrix in spiral order. We can simulate the entire traversal process. We use \ (i\) and \ (j\) to represent the row and column of the current element being visited, and \ (k\) to represent the current direction. We use an array or hash table \ (\textit {vis}\) to record whether each element has been visited.
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