用遗传算法解决旅行商问题，种群规模为2000，变异方法是将第二位上的基因放到第一位之前，适应函数为1除以路径长度8次方 ，算法迭代125次。 -Solve the using genetic algorithms, population size is 2000, the second mutation is the gene into the first before the fitness function as a path length divided by the 8