Write code to serialize and deserialize a given binary tree.

How will you compute x^y such that it will work for floats and negative values?

How can you reverse a double linked list?

Can you find a pair in array that will sum up to particular number?

I met three dragons. One always tells the truth, other one always lies and the last one alternates between lie and truth. Dragon 1: You may ask us one question, then you must guess which dragon is which Dragon 2: He’s lying. You may get three questions Dragon 3: Oh no. It’s definitely one question

An array of elements is given arr arr is of length n Right rotate array by k elements Time complexity O(n) and space complexity O(1) Sample Input: arr = {1,2 ,3,4,5} n = 5 k = 2 Output : arr = {4,5,1,2,3}

It is raining at midnight – will we have sunny weather in 72 hours?

A half is a third of it. What is it?

When was the last year that looked the same upside down? (1961)

A book costs $1 plus half its price. How much does it cost?