The wiggle problem, given an array of integers arrange them such that alternate elements are large and small.(2,5,3,6,...)
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Find and return the first duplicate integer in an array in O(n) time and O(1) space. Assume there will always be at least one duplicated integer in the array.
efficiently search for an input word in an unbounded dictionary.
What kind of data structure would you use to index annagrams of words? e.g. if there exists the word "top" in the database, the query for "pot" should list that...
You are given a random binary tree 5 / \ 4 9 / \ / \ 3 5 6 8 Write code to print it out in order level ie 5 4 9 3 5 6 8 The tree need not be balanced. Write all the datastructures for the tree and make sure that you print newlines after each level. Also write test cases to test your code.
Write an algorithm to insert a new value into a circular sorted linked list.
How would you store 1 million phone numbers?
I am playing a card game called 24. Cards ace to king are numbered 1 to 13. During a given round, I am provided four cards to play with from the shuffled pack. If the numbers from the four cards result in 24 then I win the round if I shout '24' first. How would you code a function for this?
Do you need to use the restroom?
Given a restaurant menu and a budget, output all the possible ways to use up the budget.
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