intermediate

Bitwise Manipulation

Reason directly with binary representation using XOR, masks, shifts, bit counts, and bit-level state transformations.

Problems

Problems in Bitwise Manipulation

Practice problems that share this primary solution pattern and compare the clues that reveal it.

A historic stone tower rises against a dramatic, moody sky with dark clouds.

advanced

13 min read

Divide Two Integers

Repeated subtraction computes division correctly, but it counts quotient units one at a time. Under interview constraints, that is the wrong scale of…

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Collection of handmade terracotta pots and plates on display with garden background.

intermediate

11 min read

Gray Code

Gray code looks like a permutation problem, but the useful signal is more specific: enumerate every n-bit state so that each move flips exactly one bit,…

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