插入运算符算法，123456789=a，在等式左边的任意两个数字之间插入 + - *使得等式成立，列出满足条件的所有结果-Insert operator algorithm, 123456789 = a, the left side of the equation inserted between any two figures+-* Make the equation set up, listing all of the results meet the conditions

最短路径计算,计算两点之间最短的公交线路-The shortest path calculation between two points the shortest bus route