I found the secret foobar link after searching for technical terms on Google.

I finished level 3 of the challenge and was contacted by a recruiter.

I had to fill out a questionnaire about my background and interests and then scheduled a phone interview.

The first phone interview went fine, even though I didn't get the right answer on some edge cases.

After a while, I was contacted by the recruiter for a second phone interview.

This one was supposed to be harder, and it did not go well.

I received a phone call saying that I was rejected after 3 days.

Given an input string and a list of pairs of commands and their applicable string lengths, apply the commands in order.

Given a list containing nodes of a tree in a triplet format (node ID, parent ID, weight), find the weight at each node, which is the sum of the weights of all its descendants.