View Compilation Error

0_0_35836488_26020.cpp: In function 'int main()':
0_0_35836488_26020.cpp:39:10: error: 'book' was not declared in this scope
   memset(book,0,sizeof(book));
          ^
0_0_35836488_26020.cpp:48:12: error: 'dijkstra' was not declared in this scope
   dijkstra();//这道题固定起点为1,也可在函数里自定义起点
            ^