Depth first search In depth first search (dfs) you start with a root node and keep on traversing left node (or right node) until you rea...

Below java code is a simple implementation of Least Recently Used (LRU) cache using HashMap and LinkedList. For simplicity i am taking [I...

Mocking is a way to test the functionality of a class in isolation. Mockito facilitates creating mock objects seamlessly. It uses Java Refl...

The best way would be to insert every element into a hashset. Then for every x, we can just look up its complement, T-x. Overall the Time ...

A blockchain is the structure of data that represents a financial ledger entry, or a record of a transaction. Block chain contains list of ...