How hard is LeetCode 1256. Encode Number?

LeetCode 1256. Encode Number is rated Medium on LeetCode.

What is the time complexity of LeetCode 1256. Encode Number?

The Python solution on this page runs in O(\log n).

What is the space complexity of LeetCode 1256. Encode Number?

The Python solution on this page uses O(\log n) auxiliary space.

What topics does LeetCode 1256. Encode Number cover?

LeetCode 1256. Encode Number is tagged Bit Manipulation, Math and String on LeetCode.

Is LeetCode 1256. Encode Number a premium problem?

Yes. LeetCode 1256. Encode Number is a LeetCode Premium problem, so the full statement and test cases require a paid LeetCode subscription.

Encode Number — LeetCode 1256 Python Solution

MediumLeetCode PremiumBit ManipulationMathString

Problem: #1256
Pattern: Bit Manipulation
Reading time: 2 min
Source: leetcode.com

The problem

Given a non-negative integer num, Return its encoding string. The encoding is done by converting the integer to a string using a secret function that you should deduce from the following table:

This statement is abridged. Read the full problem on LeetCode.

Example

Input: num = 23
Output: "1000"

Python solution

Python

class Solution:
    def encode(self, num: int) -> str:
        return bin(num + 1)[3:]

Complexity

Measure	Complexity
Time	O(\log n)
Space	O(\log n) auxiliary

Pattern: Bit Manipulation

Use XOR, masks and the low-bit trick to replace whole data structures with an integer. LeetCode 1256. Encode 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.

Frequently asked questions

How hard is LeetCode 1256. Encode Number?: LeetCode 1256. Encode Number is rated Medium on LeetCode.
What is the time complexity of LeetCode 1256. Encode Number?: The Python solution on this page runs in O(\log n).
What is the space complexity of LeetCode 1256. Encode Number?: The Python solution on this page uses O(\log n) auxiliary space.
What topics does LeetCode 1256. Encode Number cover?: LeetCode 1256. Encode Number is tagged Bit Manipulation, Math and String on LeetCode.
Is LeetCode 1256. Encode Number a premium problem?: Yes. LeetCode 1256. Encode Number is a LeetCode Premium problem, so the full statement and test cases require a paid LeetCode subscription.