xinyu04

摘要： Given a string s, you can transform every letter individually to be lowercase or uppercase to create another string. Return a list of all possible str 阅读全文

摘要： Given an array nums of distinct integers, return all the possible permutations. You can return the answer in any order. Solution 我们需要求出一个数组的全排列。那么还是依旧 阅读全文

摘要： Given two integers $n$ and $k$, return all possible combinations of $k$ numbers out of the range [1, n]. You may return the answer in any order. Solut 阅读全文