摘要:
Given two integers n and k, return all possible combinations of k numbers out of 1 ... n.Example:Input: n = 4, k = 2Output:[ [2,4], ... 阅读全文
摘要:
Given a collection of numbers that might contain duplicates, return all possible unique permutations.Example:Input: [1,1,2]Output:[ [... 阅读全文