Interviewer: Let's discuss the problem where we need to generate all possible permutations of a given array of distinct integers. How would you start approaching this problem? Interviewee: Sure. To ...

Backtracking has proven itself to be a universal algorithmic technique that can be applied while solving all kinds of computational problems, from the most primitive (such as counting all possible ...

模拟遍历顺序：1，1，2 -- 1，2，1 -- 1，1，2(重复)，数组中value可能相等，但是index是唯一的，于是通过boolean[]或者HashSet对index ...

Abstract: The problem of decomposing an arbitrary permutation of a large number of elements into a number of permutations of smaller numbers of elements has become important recently in rearrangeable ...