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HackerRank : 1) Code a binary tree algorithm 2) To check an ip address is IPv4 or IPv6 3) Find minimum unique sum of an array 4) get the count of set bits and position of set bits in a binary number Phone Screen 1: 1) Sparse search ( search in a sorted array containing empty strings) Phone screen 2: JAVA basics and Inorder and level order traversal of binary tree.
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