这是一个生成全排列的程序,采用最小变化算法,相邻两个序列之间只有两个数的次序不同,每交换两个数,便形成一个新的序列,速度非常快.-This is a whole generation with a procedure using the smallest change algorithm sequence between two adjacent only two of several different order every two exchanged a few, it will lead to a new series, very fast.