CodeParknums holds distinct integers. Return every way to pick some of them, from picking none to picking all. Each pick is called a subset. Only which numbers you picked matters, not their order, so [2, 5] and [5, 2] are one subset.
- Return an array of arrays. It must include the empty pick
[]and the pick of everything. - List each subset once only.
- Order doesn't matter anywhere: not the order of the subsets, and not the order of numbers inside each one.
numshas 0 to 10 numbers, each between -10 and 10. It can be empty.- Don't change
nums.
Input: nums = [2, 5, 9]
Output: [[], [2], [2, 5], [2, 5, 9], [2, 9], [5], [5, 9], [9]]There are 3 numbers, and each is either in or out. So there are 2 × 2 × 2 = 8 subsets.
Input: nums = []
Output: [[]]The only subset of an empty array is the empty subset.