Amazon Intern interview questions

1 round of Aptitude 2 rounds of Technical Interviews 1 HR Round Interviewers were friendly and quite encouraging and helpful If you want to get selected focus on Data structures. Prepare from Data Structures Made Easy By Karumanchi all questions were from here or similar to ones posted in this book.

Amazon written 20 mcq on basics of c,os,networking+ 2 coding (left view,rotate a matrix by 90 degree) Interview(round-1) 1.you have to find p,q of matrix p*q such that it fill n elements(n given) Such that a) matrix should be nearest to a square matrix and b) 0<=((p*q)-n)<=2 2. zig-zag traversal of tree 3.you are given an array of length k and it have numbers from 0 to n (where k>>>n) in O(k) time and no extra space find occurrences of each element in O(k) time only ROUND-2 1. You are given row and column wise sorted matrix you have to find and delete an element such that it is still sorted in O(n) time 2. Find if sum of any 2 elements in an array equal to k in O(n) time using extra space 3.In a bst to every element add sum of elements greater than it.