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Coding · System design
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Design a data structure that supports point updates and returns the sum of any submatrix in a 2D matrix, optimizing for many interleaved update and…
Companies: Moloco
Last reported Oct 2025
Check whether a string of parentheses/brackets is valid by ensuring every closing bracket matches the most recent unmatched opening bracket and the types and nesting…
Companies: Moloco, Amazon, Apple, Bloomberg +9
Bracket Sequences · Stack · String
Last reported Oct 2025
Design a highly scalable system that tracks and computes the top K trending hashtags (e.g., top 30-50) across different time windows (last 5/15/30/60 minutes or…
Companies: Moloco, Atlassian, Google, LinkedIn +1
Last reported Sep 2025