paradox dragon

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

Right Rotate an array by k elements

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}