Smallest Even Multiple — LeetCode 2413 Python Solution

The problem

Given a positive integer n, return the smallest positive integer that is a multiple of both 2 and n.

Example

Input

n = 5

Output

10

Explanation

The smallest multiple of both 5 and 2 is 10.

Python solution

class Solution:
    def smallestEvenMultiple(self, n: int) -> int:
        return n if n % 2 == 0 else n * 2

Complexity

Pattern: Math and Number Theory

Find the closed form, the invariant, or the modular identity — and skip the loop entirely. LeetCode 2413. Smallest Even Multiple is filed here on both counts: the reference solution below belongs to the algorithm family this hub collects, and LeetCode tags it Math and Number Theory.

The math and number theory guide has the Python template for the pattern and the 485 LeetCode problems that use it.

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