정수를 숫자 배열로 효율적으로 변환하려면 어떻게 해야 합니까?

<code class="language-c#">public Stack<int> NumbersIn(int value)
{
    if (value == 0) return new Stack<int>();

    var numbers = NumbersIn(value / 10);

    numbers.Push(value % 10);

    return numbers;
}

var numbers = NumbersIn(987654321).ToArray();</code>

<code class="language-c#">public int[] NumbersIn(int value)
{
    var numbers = new Stack<int>();

    for (; value > 0; value /= 10)
        numbers.Push(value % 10);

    return numbers.ToArray();
}</code>

<code class="language-c#">private static int[] NumbersIn(int value)
{
    if (value == 0)
    {
        return new[] { 0 }; // C# 12 集合表达式
    }
    value = Math.Abs(value);
    var digits = 1 + (int)Math.Log10(value);
    var buffer = new int[digits];
    for (var counter = 0; counter < digits; counter++)
    {
        buffer[counter] = value % 10;
        value /= 10;
    }
    Array.Reverse(buffer);
    return buffer;
}</code>