Given a collection of numbers, nums, that might contain duplicates, return all possible unique permutations in any order.

So, you want to get better at those tricky LeetCode Python problems, huh? It’s a common goal, especially if you’re aiming for tech jobs. Many people try to just grind through tons of problems, but ...

[15.1] What is the Big-O notation of an algorithm whose runtime doubles with each additional element in the input set? [15.3] An algorithm that checks each element of a list against every other ...