Possible Words From Phone Digits
Medium Accuracy: 51.74% Submissions: 8354 Points: 4

Given a keypad as shown in the diagram, and an N digit number which is represented by array a[ ], the task is to list all words which are possible by pressing these numbers.

Example 1:

Input: N = 3, a[] = {2, 3, 4}
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 
Explanation: When we press 2,3,4 then 
adg, adh, adi, ... cfi are the list of 
possible words.

Example 2:

Input: N = 3, a[] = {3, 4, 5}
dgj dgk dgl dhj dhk dhl dij dik dil 
egj egk egl ehj ehk ehl eij eik eil 
fgj fgk fgl fhj fhk fhl fij fik fil
Explanation: When we press 3,4,5 then 
dgj, dgk, dgl, ... fil are the list of 
possible words.

Your Task:
You don't need to read input or print anything. You just need to complete the function possibleWords() that takes an array a[ ] and N as input parameters and returns an array of all the possible words in lexicographical increasing order

Expected Time Complexity: O(4N).
Expected Auxiliary Space: O(N).

1 ≤ N ≤ 10
2 ≤ a[i] ≤ 9

to report an issue on this page.


We strongly recommend solving this problem on your own before viewing its editorial. Do you still want to view the editorial?


All Submissions

My Submissions:

Login to access your submissions.

Possible Words From Phone Digits

Output Window