The interview included two algorithm problems: 1. Shortest covering substring: Given two strings s and t, return the shortest contiguous substring of s that contains every character in t with at least the same multiplicity. If no such substring exists, return an empty string. 2. Minimum worker assignment: You are given a list of jobs, where each job has a start time and a duration. A job occupies the half-open interval [start, start + duration). Assign every job to a worker so that no worker is assigned overlapping jobs, and use the minimum possible number of workers. Return the worker assigned to each job in the original input order.