Solution

Method 1 – Simple Math (LCM)

Intuition

The smallest number that is a multiple of both n and 2 is their least common multiple (LCM). For any integer n, LCM(n, 2) is n if n is even, or 2n if n is odd.
Approach

If n is even, return n.
If n is odd, return 2 * n.
Code

[{"language":"C++","code":"class Solution {\npublic:\n    int smallestEvenMultiple(int n) {\n        return n % 2 == 0 ? n : 2 * n;\n    }\n};","lang":"cpp","html":"<pre class=\"shiki shiki-themes github-light github-dark\" style=\"background-color:#fff;--shiki-dark-bg:#24292e;color:#24292e;--shiki-dark:#e1e4e8\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49;--shiki-dark:#F97583\">class</span><span style=\"color:#6F42C1;--shiki-dark:#B392F0\"> Solution</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\"> {</span></span>\n<span class=\"line\"><span style=\"color:#D73A49;--shiki-dark:#F97583\">public:</span></span>\n<span class=\"line\"><span style=\"color:#D73A49;--shiki-dark:#F97583\">    int</span><span style=\"color:#6F42C1;--shiki-dark:#B392F0\"> smallestEvenMultiple</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">(</span><span style=\"color:#D73A49;--shiki-dark:#F97583\">int</span><span style=\"color:#E36209;--shiki-dark:#FFAB70\"> n</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">) {</span></span>\n<span class=\"line\"><span style=\"color:#D73A49;--shiki-dark:#F97583\">        return</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\"> n </span><span style=\"color:#D73A49;--shiki-dark:#F97583\">%</span><span style=\"color:#005CC5;--shiki-dark:#79B8FF\"> 2</span><span style=\"color:#D73A49;--shiki-dark:#F97583\"> ==</span><span style=\"color:#005CC5;--shiki-dark:#79B8FF\"> 0</span><span style=\"color:#D73A49;--shiki-dark:#F97583\"> ?</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\"> n </span><span style=\"color:#D73A49;--shiki-dark:#F97583\">:</span><span style=\"color:#005CC5;--shiki-dark:#79B8FF\"> 2</span><span style=\"color:#D73A49;--shiki-dark:#F97583\"> *</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\"> n;</span></span>\n<span class=\"line\"><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">    }</span></span>\n<span class=\"line\"><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">};</span></span></code></pre>"},{"language":"Java","code":"class Solution {\n    public int smallestEvenMultiple(int n) {\n        return n % 2 == 0 ? n : 2 * n;\n    }\n}","lang":"java","html":"<pre class=\"shiki shiki-themes github-light github-dark\" style=\"background-color:#fff;--shiki-dark-bg:#24292e;color:#24292e;--shiki-dark:#e1e4e8\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49;--shiki-dark:#F97583\">class</span><span style=\"color:#6F42C1;--shiki-dark:#B392F0\"> Solution</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\"> {</span></span>\n<span class=\"line\"><span style=\"color:#D73A49;--shiki-dark:#F97583\">    public</span><span style=\"color:#D73A49;--shiki-dark:#F97583\"> int</span><span style=\"color:#6F42C1;--shiki-dark:#B392F0\"> smallestEvenMultiple</span><span style=\"color:#24292E;-
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