EasyNo. 2220
Minimum Bit Flips to Convert Number — LeetCode 2220 Python Solution
- Pattern
- Bit Manipulation
- Topics
- Bit Manipulation
- Reading time
- 2 min
- Source
- leetcode.com
The problem
A bit flip of a number x is choosing a bit in the binary representation of x and flipping it from either 0 to 1 or 1 to 0. For example, for x = 7, the binary representation is 111 and we may choose any bit (including any leading zeros not shown) and flip it.
Example
- Input
- start = 10, goal = 7
- Output
- 3
- Explanation
- The binary representation of 10 and 7 are 1010 and 0111 respectively. We can convert 10 to 7 in 3 steps:
Python solution
class Solution:
def minBitFlips(self, start: int, goal: int) -> int:
return (start ^ goal).bit_count()Complexity
- Time
- O(log n)where n is the size of the integers in the problem
- Space · auxiliary
- O(1)
Pattern: Bit Manipulation
Use XOR, masks and the low-bit trick to replace whole data structures with an integer. LeetCode 2220. Minimum Bit Flips to Convert Number is filed here on both counts: the reference solution below belongs to the algorithm family this hub collects, and LeetCode tags it Bit Manipulation.
The bit manipulation guide has the Python template for the pattern and the 194 LeetCode problems that use it.
Related problems
| No. | Problem | Difficulty |
|---|---|---|
| 0029 | Divide Two Integers | Medium |
| 0067 | Add Binary | Easy |
| 0136 | Single Number | Easy |
| 0137 | Single Number II | Medium |
| 0190 | Reverse Bits | Easy |
| 0191 | Number of 1 Bits | Easy |
Frequently asked questions
- How hard is LeetCode 2220. Minimum Bit Flips to Convert Number?
LeetCode 2220. Minimum Bit Flips to Convert Number is rated Easy on LeetCode.
- What is the time complexity of LeetCode 2220. Minimum Bit Flips to Convert Number?
The Python solution on this page runs in O(log n), where n is the size of the integers in the problem.
- What is the space complexity of LeetCode 2220. Minimum Bit Flips to Convert Number?
The Python solution on this page uses O(1) auxiliary space.
- What topics does LeetCode 2220. Minimum Bit Flips to Convert Number cover?
LeetCode 2220. Minimum Bit Flips to Convert Number is tagged Bit Manipulation on LeetCode.