Given an array of task durations (in minutes), return the pairs of tasks that can be completed within 60 minutes. For example, for [1, 43, 20, 59, 30, 30], return [[0, 3], [4, 5]].

"Very rigorous. Interviewers were in a rush. I believe it’s crucial to get a feel of what you should expect during the interview and what kinds of signals you need to give. So I strongly recommend scheduling mock interviews with peers or, much more preferably, actual google or Facebook employees."