分派问题: 给n个人分派n件作业, 把工作j分派给第i个人的成本为cost(i, j), 设计、编程、测试回溯算法, 在给每个人分派一件不同工作的情况下使得总成本最小-Distribution: distribution of n to n personal job, the job j is assigned to the i-th individual cost cost (i, j), design, programming, testing backtracking algorithm,