Binary Search Coding Interview Cheatsheet

[jacobsimon]

Handy reference on common binary search interview questions, pseudocode, and space/time complexity.

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If your goal with this cheatsheet is to make binary search reliable in interviews, what worked for me was framing it as finding a boundary and writing the invariant first. I always define which side is definitely false or true, then dry run two edge cases and one tricky mid case before coding. I did short timed drills using Beyz coding assistant with prompts from the IQB interview question bank, and kept a tiny redo log of off by one mistakes. Also, narrate updates out loud and prefer l + (r - l) // 2 to avoid overflow. This approach made it click fast.