Oracle Applications Engineer interview questions

Round 1 1. Most efficient way to find the square root of a number 2. Given a sentence, find the frequency of words in the sentence. Round 2 1. Given a 3 digit number, convert it to words. 2. Memory management in C/Python Round 3. 2 questions that were very practical and not the basic DSA stuff. 1. Find factorial of a very large number (I used "long long" and then tries using array based approach but I was told both approaches are wrong and there exist something better) 2. Given a very large string reverse it. (All of the string can't fit into memory) 3. 3 quizzes were given. The next round was HR. I did not get a call and I was rejected before HR.