View Compilation Error

0_0_30525567_22668.cpp:26:1: error: expected initializer before 'int'
 int top = -1 ;
 ^
0_0_30525567_22668.cpp: In function 'void dfs(int, int)':
0_0_30525567_22668.cpp:42:2: error: 'fa' was not declared in this scope
  fa[0] = -1 ;
  ^
0_0_30525567_22668.cpp:43:8: error: 'top' was not declared in this scope
  lst[++top] = u ;
        ^
0_0_30525567_22668.cpp:64:3: error: expected ';' before '}' token
   }
   ^