Q1: Given an array of strings where each string denotes an integer find the second-highest number
Q2: Given a Binary tree u need to convert it to a doubly-linked list
Q3: Given an Array of Integers Find how many pairs of bits are different where both the bits doesn't belong to the same number

Question

Q1: Given an array of strings where each string denotes an integer find the second-highest number 
Q2: Given a Binary tree u need to convert it to a doubly-linked list
Q3: Given an Array of Integers Find how many pairs of bits are different where both the bits doesn't belong to the same number

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