Find all unique combinations of numbers from a given array that sum up to a specific target value. You can use the same number multiple times.

Given a sequence of words and a line width, format the text to fit within the specified width. You must justify the text, distributing extra spaces evenly between words.

You're given a list of jobs with start times, end times, and profits. Find the maximum profit you can obtain by scheduling a subset of jobs that don't overlap.