Visa Inc. Software Engineer- New Grad interview questions

The first round is a 30 minute technical phone interview. It was fun to go through the questions with the interviewer especially beacause he was hinting me whenever I got stuck. I was asked basic data structure and algorithm questions (example - how would design a random number generation function, what data structure would you use to store the web pages visited by a user as he clicks on the forward and back buttons in the browser). Just try to think as logically as possible! Second round was a hackerrank challenge - 3 questions. Could solve only 2, was rejected after this.

First phone call interview - was simple. Asked basic questions on SQL, data structures, algorithms and questions on Java. Was very polite and patient. I couldn't deliver well enough as I wasn't prepared for a technical interview. I had answered as best as I could, the questions were easy enough.