Define union-by-weight?
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What is data structure and why we need it?
Will it create any problem if we add elements with key as user defined object into the treemap?
Is Arraylist faster than Array? Why?
Differentiate between hashmap and hashtable.
What is the difference between a push and a pop?
An array having 100 elements have numbers from 1 to 99 randomly out of which any number is repeated. Find the repeated number in minimum time and space complexity.
Explain recursive function & what is the data structures used to perform recursion?
What does list clear do?
What is an externalizable interface?
Can we add duplicate keys in a hashmap?
Define structure property in a heap?
What is the maximum total number of nodes in a tree that has N levels? Note that the root is level (zero)
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