Amazon Interview Question
Software Engineer / DevelopersTeam: Data Storage
Country: India
Interview Type: Phone Interview
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We can implement the trie datastructure using a queue. So for any keypress, we push the corresponding letters in the queue. If no other key is pressed, it is our answer, else for the next key press, we dequeue the elements, add the the other letters to them like in a trie and insert them at the back of the queue.
- NS September 23, 2011e.g.
Keypress order - 415
key - 4
insert - jkl
key - 1
insert - ja jb jc ka kb kc la lb lc
key - 5
insert - jam jan jao / jbm jbn jbo / jcm jcn jco/ kam kan kao/ kbm kbn kbo/ kcm kcn kco .. so on...
If anymore numbers are pressed, keep repeating the process, else the queue is the solution.