Web Reference: Oct 3, 2025 · This approach uses list comprehension to reverse the rows in the input 2D array. It first initializes an empty list and then iterates over each row of the input array, reversing each row using the [::-1] slicing notation and appending the reversed row to the empty list using the append () method. Start by extracting the algorithm to reverse a 1-D array into a method. That will already make the code easier to understand, and solve one of the bugs. Then execute your reverse algorithm on paper, noting the value of each variable at each instruction. You'll understand where it's wrong. Aug 24, 2024 · To help understand how to reverse rows in place, we can think of each row of a 2d array as a 1d array. Hence, the algorithm for the 1d array is straightforward: we simply swap the current index’s element with the one in its symmetric index until we reach the middle element.
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