What does arraylist remove do?
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Why does hashset use hashmap?
Where is binary tree used?
What do you mean by union-by-weight?
What is a class user?
How can one find a cycle in the linked list? IF found how to recognize the cycle and delete that cycle?
Which is faster arraylist or hashmap?
Is treeset synchronized?
Is stack a dynamic data structure?
Can arraylist have duplicates?
How does hashset maintain order?
Why do we need a data structure?
On clicking a node in a tree, all the adjacent edges are turned on. Calculate min of clicks such that all the edges are turned on.