Combinations: Given two integers n and k, return all possible combinations of k numbers chosen from the range [1, n].
read moreCombinations: Given two integers n and k, return all possible combinations of k numbers chosen from the range [1, n].
read morePermutations II: Given a collection of numbers, nums, that might contain duplicates, return *all possible unique permutations in any order*.
read morePermutations: Given an array nums of distinct integers, return all the possible permutations.
read moreSubsets II: Given an integer array nums that may contain duplicates, return all possible subsets (the power set).
read moreSubsets: Given an integer array nums of unique elements, return all possible subsets (the power set).
read moreLetter Combinations of a Phone Number: Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent.
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