Count connected delivery zones

Q: Count connected delivery zones

This is a Coding & Algorithms interview question from Uber for Machine Learning Engineer roles. View the full question and solution on PracHub.

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Question

Given an m x n grid representing a service area, each cell is either 'Z' (deliverable zone) or '#' (blocked). Two 'Z' cells belong to the same zone if they are 4-directionally adjacent. Implement countZones(grid: List[List[char]]) -> int that returns the number of connected zones. Follow-up: return the sizes of all zones in descending order. Analyze time and space complexity, and then optimize for minimal extra space.

Count connected delivery zones

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