设有n件工作分配给n个人，将工作i分配给第j个人所需要的费用为Ci。试 设计一个算法，为每一个人都分配1件不同的工作，并使总费用达到最小。-suppose n pieces of work are arranged to n persons, it costs Ci to arrange work i to people j. design a algorithm to make it cost least and to make sure that everyone get one different job.