Google Sr. Software Engineer interview questions

A recruiter reached out and talked through the intervew process and scheduled the first DSA round. The interviewer asked a OO question to model a system to represent a real time stock feed and make the system able to query current price of the stock, maximum price and minimum price at any given time. Given the stock price feed is a List> and the list can be updated correcting any past wrong records as well. Followed by another coding round where there was a different question, this time the question was on Graph traversal - The question was - Given n routers represented by their x,y coordinates and range for each router to transmit a message was R, find if a message can be sent from a given source router to a given destination.