Traverse a grid in a zigzag row order while skipping cells at a fixed interval.
Zigzag Grid Traversal With Skip
You are given a 2D grid with m rows and n columns, and a positive integer skip.
Traverse the grid row by row in a zigzag pattern:
- row
0is read left to right, - row
1is read right to left, - row
2is read left to right, - and so on.
As you visit cells in this zigzag order, keep only the cells that are not skipped. A cell is skipped according to the given skipping rule for the problem, and you must return the values of the cells that remain after applying the rule.
Your task is to produce the traversal result in order.
Input Format
- A 2D integer grid
gridof sizem x n. - An integer
skipdescribing the skip interval/rule.
Output Format
- Return an array of integers containing the values collected during the zigzag traversal after applying the skip rule.
Constraints
1 <= m, ngridcontains integersskipis a positive integer- The grid size is small enough for straightforward traversal in an interview setting
Hints
- First focus on generating the zigzag order correctly.
- Use a counter while traversing to decide whether the current cell should be kept or skipped.
- Be careful with row direction changes on alternating rows.
Input Format
grid: integer matrixskip: positive integer
Output Format
- Integer array representing the collected values in traversal order
Constraints
- Traverse all cells in zigzag row order.
- Apply the skip rule consistently while visiting cells.
- Return values in the exact order they are collected.
Example 1
Input
grid = [[1,2,3],[4,5,6],[7,8,9]], skip = 3
Output
[1,2,4,5,7,8]
Explanation
Zigzag order is [1,2,3,6,5,4,7,8,9]. Skipping every 3rd visited cell removes 3, 6, and 9, leaving [1,2,4,5,7,8].
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