用优化算法求解运输问题。

1.不使用linprog，比较歧异解

2.用西北角法求初始基本可行解，用闭回路法确定退出基和更新运输矩阵

3.不能处理非平衡的运输问题-Optimization algorithm used to solve transport problems. 1. Do not use linprog, compare differences solution 2. With the northwest corner of France seeking an initial basic feasible solution, using closed-loop method to determine the transport out of the base and update the matrix 3. Can not handle the transport of non-equilibrium