Explain the uses of binary tree.
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Which is more efficient merge sort vs quicksort?
What is data structure and its types?
What does arraylist remove do?
Does hashmap allow duplicate keys?
How would you implement two stacks using a single array?
Write programs for Bubble Sort, Quick sort
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 a list an array?
Can arraylist store primitives?
Are lists mutable?
How many types of arrays are there?
What is significance of ” * ” ?