private void DoPhoneCombi(byte[] arr, StringBuilder sb, int len, int level)
{
if (level == len)
{
Console.WriteLine(sb.ToString());
return;
}
byte x = arr[level];
int upCap = (x < 2) ? 1 : 3;
for (byte i = 1; i <= upCap; i++)
{
sb.Append(PhoneNumberChars.GetChar(x, i));
DoPhoneCombi(arr, sb, len, level + 1);
sb.Length -= 1;
}
}
private static void DoPhoneCombination(byte[] phoneNumber, StringBuilder sb, int level)
{
if (level == phoneNumber.Length)
{
Console.WriteLine(sb.ToString());
return;
}
byte X = phoneNumber[level];
int upCap = (X < 2) ? 1 : 3;
for (byte i = 1; i <= upCap; i++)
{
sb.Append(PhoneNumberChars.GetChar(X, i));
DoPhoneCombination(phoneNumber, sb, level + 1);
sb.Length -= 1;
}
}
