2413. Smallest Even Multiple

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Asked by 3 companies

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

Example 1:

Input: n = 5
Output: 10
Explanation: The smallest multiple of both 5 and 2 is 10.

Example 2:

Input: n = 6
Output: 6
Explanation: The smallest multiple of both 6 and 2 is 6. Note that a number is a multiple of itself.

Constraints:

Hint 1

A guaranteed way to find a multiple of 2 and n is to multiply them together. When is this the answer, and when is there a smaller answer?

Hint 2

There is a smaller answer when n is even.