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Leetcode 346. Moving Average from Data Stream

Design a data structure that, given a continuous stream of numbers and a fixed window size k, returns the moving average of the last k values each time a new value arrives. The challenge is to maintain the sliding window efficiently (constant-time update and query) while using only O(k) space.

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Meta

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Company

Level

Region

Late September, 2025

Meta

Senior

Early September, 2025

Meta

Senior

Early August, 2025

Meta

Senior

Variant: entire array available at once, sliding window

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