Challenge problem

#1

can anyone tell me output if my input is 123?

#2

Hey @VinayakSingh11111
adg adh adi aeg aeh aei afg afh afi bdg bdh bdi beg beh bei bfg bfh bfi cdg cdh cdi ceg ceh cei cfg cfh cfi
27

#3

can anyone help me with the steps to solve this?

#4

@VinayakSingh11111
we use recursion.

  1. Create a database table to store all characters correspond to digit i in the keyboard.
  2. We store all possible words that can be obtained by input string[] of size n.
  3. We store words in ans string
  4. Try all possible characters for current digit and recursion for remaining digits.
  5. We print the final ans string