通过分支限界的方法，求解1到n的最短路径。设数组a保存图的邻接矩阵，0-9号，共10个节点。节点1为源点，n为目标点.-Through the branch and bound approach for solving 1 to n shortest path. A preservation plan for an array of adjacency matrix ,0-9, a total of 10 nodes. Node 1 is the source, n for the target