输出某个串的所有排列.枚举某个串的所有排列，从中找出一个排列使其满足：它的和是所有排列的和中小于sample的最大的一个.-All of the output to a string array. Enumerate all the permutations of a string, from which to find an arrangement to meet: It is all arranged and smaller than the sample and in the larges