' write a flood fill algorithm '

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Anu Bhardwaj · Accepted Answer

To implement the floodedRegionsIn method as described in the image, you need to simulate the rise in sea levels using a breadth-first search (BFS) algorithm. Here's a step-by-step approach to how you can achieve this: Initialize a boolean 2D array (resulting array): This array will keep track of whether a grid location is flooded ( true ) or not ( false ). Initialize an ArrayList of GridLocations: This list will be used to manage the locations to be processed in the BFS algorithm. Add all water source GridLocations to the ArrayList: Mark these source locations as flooded in the resulting array. Breadth-First Search (BFS) Process: Continue processing until the ArrayList is empty: Remove the first element from the ArrayList. Check all neighbors (up, down, left, right) of this element. If any neighbor's height is less than or equal to the provided height parameter, mark it as flooded and add it to the ArrayList. Return the resulting array: The array now represents the flooded regions. Here’s a sample implementation in Java: This Python version follows the same logic as the Java code but is adapted to Python syntax and constructs. The GridLocation class is used to store row and column indices. The BFS is implemented using a deque for efficient popping from the front of the queue. The heightMap and flooded arrays are processed according to the given height parameter.

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Anu Bhardwaj

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