利用模拟退火算法实现有向图最短路径的计算，基本与康立山的参数确定方法相同，只是结束条件改为温度下降到0.2截止。-Simulated annealing algorithm has to map the shortest path calculation, basic and Kang Lishan determine the parameters of the same way, but the conditions to end cut-off temperature dropped to