摘要: public class Permutation { private static int A(int down, int up) { if(down < up || up <= 1) return -1; int res = 1; while(up-- > 0) { res *= down--; 阅读全文
posted @ 2016-03-24 15:00 Netop 阅读(228) 评论(0) 推荐(0)