Daily coding questions. The creator of the site has executed over 100 daily coding questions and now provides examples of the answers.
| Given a set of closed intervals, find the smallest set of numbers that covers all the intervals. |
| If there are multiple smallest sets, return any of them. |
| For example, given the intervals [0, 3], [2, 6], [3, 4], [6, 9], |
| one set of numbers that covers all these intervals is {3, 6}. |