Algorithms Pigeonhole Sort suggest change

C Implementation

public class PigeonholeSort
{
    private static void SortPigeonhole(int[] input, int n)
    {
        int min = input[0], max = input[n];
        for (int i = 1; i < n; i++)
        {
            if (input[i] < min) min = input[i];
            if (input[i] > max) max = input[i];
        }
        int range = max - min + 1;
        int[] holes = new int[range];

        for (int i = 0; i < n; i++)
        {
            holes[input[i] - min] = input[i];
        }
        int index = 0;

        for (int i = 0; i < range; i++)
        {
            foreach (var value in holes)
            {
                input[index++] = value;
            }
        }
    }

    public static int[] Main(int[] input)
    {
        SortPigeonhole(input, input.Length);
        return input;
    }
}

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