给出一字符串，计算出其所有不同的字符排列子集。即，接收用户输入的一字符串，将此字符串中的不同字符找出，并将找出的字符进行组合，再把组合的结果进行全排列。-Given a string, calculate the arrangement of all of its different character subsets. That is, to receive user input a string of different characters in this string to find,