View Compilation Error

0_0_22383393_10252.cpp: In function 'void add_edge(int, int, int)':
0_0_22383393_10252.cpp:26:2: error: 'edge' was not declared in this scope
  edge[++edgeNum].next = head[from];
  ^
0_0_22383393_10252.cpp:26:9: error: 'edgeNum' was not declared in this scope
  edge[++edgeNum].next = head[from];
         ^
0_0_22383393_10252.cpp:26:25: error: 'head' was not declared in this scope
  edge[++edgeNum].next = head[from];
                         ^