Given a 3x3 keypad with ABC on number 2, DEF on number 3 and so on. Given a set of numbers, output all the english words that can be obtained from it. Assume an in-built function exists to check if the given word is an english word or not. Eg: inuput: 228, output: bat, cat, act and so on.
Second Interview: Write a function that takes a binary search tree and returns an array with the in-order permutation of the tree.
Given 2 strings, how can you determine that one string is only made of characters found in the second string.
Test whether a binary tree is symmetrical in both data and shape
Reverse a string.
How do you find if two values in an array sum to a given value? Make it as efficient as possible.
What is the difference between an array and a linked list? When might you use either data structure?
Reverse a singly linked list
leetcode Single Number
Write a function to serialize a binary tree.
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