摘要： Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possib 阅读全文

摘要： The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order,We get the following sequence 阅读全文

摘要： Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2] have the following unique pe 阅读全文

摘要： Given a collection of distinct numbers, return all possible permutations. For example, [1,2,3] have the following permutations: 终于开始做回溯的题目了，其实这是一道枚举的题 阅读全文