Bit manipulation uses operators like AND, OR, XOR, NOT, and shifts to work on the individual bits of integers. It enables compact state, fast arithmetic tricks, and elegant solutions to problems such as finding a single unique element.
Bit manipulation - Interview Concepts - ExtraBrain is part of ExtraBrain's local-first Mac workflow for live interviews, meetings, transcription, provider control, and responsible AI use.
Bit manipulation uses operators like AND, OR, XOR, NOT, and shifts to work on the individual bits of integers. It enables compact state, fast arithmetic tricks, and elegant solutions to problems such as finding a single unique element.
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AND, OR, XOR, NOT, and left and right shifts read and change bits directly.
XOR cancels duplicates, n and (n minus 1) clears the lowest set bit, and masks toggle flags.
A single integer can represent a set of up to 64 booleans, useful in subset and dynamic programming problems.
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XOR finds a single non-duplicated number, swaps values without a temporary, and toggles bits, since a value XOR itself is zero.
A bitmask is an integer whose bits represent a set of flags or a subset, enabling fast set operations.
