Date: 2026-06-06
Time: 18:21
number-of-steps-to-reduce-a-number-to-zero/solution.pyThis file implements LeetCode 1342: Number of Steps to Reduce a Number to Zero. It owns a single responsibility: given a non-negative integer, count how many steps it takes to reach zero by repeatedly halving (if even) or subtracting one (if odd).
Solution class — Container following LeetCode's expected interface.
queensAttacktheKing(self, num: int) -> int — The core implementation. Despite the name (which belongs to LeetCode 1222, an entirely different problem about chess queens), this method implements the reduce-to-zero algorithm. The docstring is correct even though the method name is wrong.
numberOfSteps — A class-level alias (line 17) that binds the correct LeetCode method name to the misnamed implementation. This is what test files call. It's assigned as a bare attribute, not a @property or wrapper — it's just another name for the same unbound function object.
numberOfSteps = queensAttacktheKing is a Python idiom for giving a function a second name without a wrapper. Both names resolve to the same function object at class definition time. This pattern appears across this repo as a way to keep a canonical implementation under one name while exposing the LeetCode-expected name.Solution class convention: Every problem uses a class Solution with a method matching the LeetCode signature. The repo standardizes on this even though LeetCode itself doesn't require the class to live in a file named solution.py.Imports: None. The file is entirely self-contained — no stdlib, no third-party, no project-internal imports.
Imported by: The "Imported By" list shows ~400+ test files across the repo referencing this module. That massive fan-in is a repo-level artifact — those test files are almost certainly importing their *own* local solution.py via a relative or path-based import pattern, and the static analysis tool flagged them all as importing from this one. The real consumer is number-of-steps-to-reduce-a-number-to-zero/test_solution.py.
1. Initialize steps = 0.
2. Loop while num > 0:
num is even (num % 2 == 0): integer-divide by 2.num is odd: subtract 1 (making it even for the next iteration).steps.3. Return steps.
This is a direct simulation — no closed-form math, no bit tricks. For num = 14: 14→7→6→3→2→1→0 = 6 steps.
num is non-negative: The while loop guard num > 0 assumes this. A negative input would skip the loop and return 0, which is incorrect but won't raise.num (even case) or decrements it by 1 (making it even), so num strictly decreases toward 0 in at most O(2 * log₂(num)) steps.if/else covers all integers, so every iteration makes progress.None. No input validation, no exceptions raised, no edge-case guards. The code trusts the caller to provide a non-negative integer per the LeetCode contract. Passing a float, negative, or non-numeric value would either produce wrong results or raise a TypeError from the modulo/division operators.