LC-1342 Easy LeetCode

1342. Number of Steps to Reduce a Number to Zero

Read the full problem statement on LeetCode.

Difficulty: easy Acceptance: 86% Topics: Math, Bit Manipulation

Reading material

Math & Geometry 12 min Bit Manipulation 10 min

Reference solution (spoiler · python)

# Time:  O(logn)
# Space: O(1)

class Solution(object):
    def numberOfSteps (self, num):
        """
        :type num: int
        :rtype: int
        """
        result = 0
        while num:
            result += 2 if num%2 else 1
            num //= 2
        return max(result-1, 0)

Solution from kamyu104/LeetCode-Solutions · MIT