https://leetcode.com/problems/partitioning-into-minimum-number-of-deci-binary-numbers/
https://leetcode.com/problems/implement-queue-using-stacks/
https://leetcode.com/problems/reformat-the-string/
https://leetcode.com/problems/first-unique-character-in-a-string/
https://leetcode.com/problems/three-divisors/
https://leetcode.com/problems/pascals-triangle-ii/
https://leetcode.com/problems/make-the-string-great/
https://leetcode.com/problems/delete-characters-to-make-fancy-string/