n个数的全排列的非递归算法，cpp文件可编译运行-n the number of full-order non-recursive algorithm, cpp files can be compiled to run

实现字符的全排列，C++ 源代码，如 输入a，b，c，就会输出全排列：aa，bb，cc，ab，ac，bc-Achieve full array of characters, C++ source code, such as the input a, b, c, it will output the whole array: aa, bb, cc, ab, ac, bc