נתונות הפעולות הרקורסיביות what ו-secret הבאות:

```csharp
public static int What(int num)
{
    return What(num,1);
}
private static int What(int num, int c)
{
    int a;
    if(num < 10) return c;
    if(num%10 ==num/10%10)
        a = What(num/10, c+1);
    else
        a = What(num/10, 1);
    return Math.Max(a, c);
}

public static int Secret(int[] arr)
{
    return Secret(arr, 0, arr.Length-1);
}
private static int Secret(int[] arr, int left, int right)
{
    if(left == right) return arr[left];
    if(What(arr[left]) < What(arr[right]))
        return Secret(arr, left +1, right);
    return Secret(arr, left, right -1);
}