View Compilation Error

0_0_24314932_15652.cpp: In function 'void addedge(int, int)':
0_0_24314932_15652.cpp:24:2: error: 'edge' was not declared in this scope
  edge[tol].from = u;
  ^
0_0_24314932_15652.cpp: In function 'void work()':
0_0_24314932_15652.cpp:94:9: error: 'head2' was not declared in this scope
  memcpy(head2, head, sizeof(head));
         ^