Amazon Support Engineer interview questions

they first ask me about myself and about my projects and then start asking me questions based on my resume and then they ask me to share my screen and give me questions to code the first code that they told me to write was the perfect number and in second coding question, they told me to write a program to sort the array based on the frequency of elements, after that, they ask me some behavioral questions.

what is tcp/udp? what is recursion? what is undirected graph and implement it?