What do you mean by 2-3-4 tree?
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What is the difference between list and arraylist?
Can arraylist have null values?
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 ].
Is red black tree balanced?
How do you sort an arraylist in descending order?
Is radix sort stable?
How do you balance a tree?
What is hashing in cyber security?
What is sorted list in data structure?
Can we add duplicate keys in a hashmap?
What does the dummy header in the linked list contain?
Explain quick sort and merge sort algorithms and derive the time-constraint relation for these.