intro practice · coding problem
Reverse Bits
LeetCode #190 — Reverse Bits. Solve on LeetCode, then implement here if you want it in your drill queue. https://leetcode.com/problems/reverse-bits/
The mechanism
Bits give you three superpowers: a bitmask is an O(1) set, XOR cancels duplicates, and checking power-of-2 is a single AND. Two tricks worth memorizing: n & (n-1) clears the lowest set bit, and XOR-ing equal values gives zero.
Expected evidence
Pass all LeetCode test cases for this problem.
Try this drill in the practice workspace →
Hints when you need them
- Pattern hint: bit manipulation.
- Start with brute force, then optimize time/space.
- Write down invariants before coding.