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Bit Manipulation

AND, OR, XOR, shifts, and the little tricks (n & -n, n & (n-1)) that win interviews.

Browse 2 tutorials → Other topics

Why learn Bit Manipulation?

  • Tiny topic, big interview signal.

  • Unlocks elegant O(1) solutions to specific problems.

  • A required tool for low-level and systems work.

What you can build with Bit Manipulation

Single-number (XOR) family Bitmask DP Low-level system flags and permissions

Bit Manipulation tutorials

2 articles · page 1 of 1

Hand-written tutorials, ordered as a recommended learning path.

  1. 01 Missing Number Solve the Missing Number problem with three approaches: hashing, Gauss sum formula, and XOR. Includes complexity analysis and interview tips.
  2. 02 Single Number Solve the Single Number problem in O(n) time and O(1) space using XOR. Includes a walkthrough, edge cases, and follow-up variants.