The interviews started at 9 a.m. in Fargo, ND. I had interviews with a total of four engineers who asked progressively more involved questions.

After three hours of interviews with the first two engineers, a third engineer took me to lunch on their campus. The food was fantastic.

After lunch, I interviewed with that engineer and finished with the engineering lead manager, totaling over six hours of interviews. The questions weren't too hard, and the engineers were all more focused on how you approach problems.

Given a string, find the longest substring of distinct characters. Provide its time and space analysis.

Given a number, determine if it contains no more than one appearance of any number in a given set.

Given a simple clock and the current time, how would you find the angle between the hour and minute hand?

Construct a data structure to implement a tree with an arbitrary number of children. Implement functions to perform delete, insert, and lookup of nodes.

Given a string, compress it so that "aaabbbccc" becomes "3a3b3c".