用模拟退火求最短路径，先用蒙特卡罗随机初始化，再进行退火，使收敛的速度快一点，保证解的准确(The shortest path is obtained by simulated annealing. First, the Monte Carlo is initialized randomly, then the annealing is carried out to make the convergence speed a little faster, so as to ensure the accuracy of the solution.)