Which sorting algorithm uses minimum number of swaps?
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Differentiate between queue and stack.
State the difference between stacks and linked lists?
In what areas do data structures applied?
Define double hashing?
What is a stable sort?
What do you mean by 2-3 tree?
Define graph?
an array of size N in which every number is between 1 and N, determine if there are any duplicates in it. You are allowed to destroy the array if you like. [ I ended up giving about 4 or 5 different solutions for this, each supposedly better than the others ].
Explain binary searching, Fibonacci search.
What is the difference between hashmap and treemap?
Which is faster hashmap or hashset?
Define hash table?