Given an array of integers and k, print all the pairs of numbers (a,b), both of them inside the array, such that a+b=k
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Most efficient algorithm for sorting infinitely long array
Questions related to stacks, queues (Eg:Implement a queue using stacks) Trees were heavily asked as well (Print a tree spirally, check if one BT is a mirror of another BT)
Check given binary tree is BST or not
design the objects needed to run a jukebox.
In an array, all numbers appear even times, while on number appears odd times. Find that number
Write a program for creating Huffman Coding for a set of characters given its frequency table.
1) Write a prime number service in language of your choice. how you scale it. 2) design an airline company in object-oriented way.
If you get an array of integers, find the only integer that is repeated for an odd number of times.
Implement a data structure like a stack but with a way to find a max at O(1) time.
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