Binary search locates a value in sorted data by comparing the middle element to the target and discarding half the range each step, achieving O(log n) time.
Binary search - Interview Concepts - ExtraBrain is part of ExtraBrain's local-first Mac workflow for live interviews, meetings, transcription, provider control, and responsible AI use.
Binary search locates a value in sorted data by comparing the middle element to the target and discarding half the range each step, achieving O(log n) time.
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Track low and high bounds, compute a mid index, and move the bound that cannot contain the target.
Many problems binary search over a range of possible answers, not just array indices.
Guard against overflow in mid calculation and off-by-one errors in loop bounds and termination.
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Short answers for people and crawlers comparing ExtraBrain with other live AI assistants.
Use it when data is sorted or when the answer space is monotonic, so you can discard half the range each step.
Binary search runs in O(log n) time and O(1) extra space in its iterative form.
