Amazon Interview Question

In written round they asked me to write 2 programs and find errors in one program. Programs were to reverse a linked list with specific no of nodes. Other program was to count all nodes in a Binary Tree. And last question was to find error in a program which was a factorial function written with conditional operator. 1st Technical Interview, It was taken by 2 interviewers, I was asked to write a program to find frequency of all elements in an array, and display element with maximum frequency. They asked me implementation of HashMap in Java. About different sortings, time complexity of all above program which I wrote. I was given one problem solving question from Amazon project. 2nd Technical Interview, I was asked to write a program, One sorted array was given and a number X was given, find to elements in an array whose exact difference is X. Another program to extract integers from a string and add them. Was asked to optimize my code. How to store negative numbers from string to integer. Interviewer told about their current project. 3rd Managerial Interview, He asked me how my day went till now in Amazon office. What is my role in current company. What exactly I do in my current company. What you do when you are annoyed at your manager. How do you like working in a team, specially when there is less coordination. Have I ever handled any major complication in my current project. Amazon leadership principles. He told me about Amazon work culture. Asked how to debug a code snippet. All interviewers were helpful and patient. They listen to your solutions. I was a complete sponsored day by Amazon office. Only one concern, you have to wait a lot after every round. Whole process will take around 6-7 hours.