Bit Manipulation pattern
Number of 1 Bits
Given an unsigned integer n, return the number of set bits (its Hamming weight). Watch it run step by step, then write your own pseudocode and get it checked by AI.
- LeetCode 191
- Easy
- 2 approaches
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Bit ManipulationLeetCode 191
Easy
From the first idea to the best one
- 01 Check each bit O(#bits)O(1) space
- 02 Optimized · n & (n − 1) O(#set bits)O(1) space
What you will learn
- How to read Number of 1 Bits and spot the bit manipulation pattern in it
- Check each bit: O(#bits) time, O(1) space
- Optimized · n & (n − 1): O(#set bits) time, O(1) space
- The pseudocode for each approach, its line lit as the animation runs
- Practice: write your own pseudocode and get it checked
More Bit Manipulation
See Number of 1 Bits run, step by step
Sign in and this page opens on the animation, with all 5 Bit Manipulation problems beside it.
DSA comes with the all labs plan and every ChaiCode batch.