View Compilation Error

0_0_28663387_26007.cpp: In function 'void Dfs(int, char)':
0_0_28663387_26007.cpp:34:6: error: 'a' was not declared in this scope
  if (a[x].end == m)
      ^
0_0_28663387_26007.cpp:40:22: error: 't' was not declared in this scope
  for (int i = 0; i < t; i++)
                      ^
0_0_28663387_26007.cpp:42:32: error: 'struct m' has no member named 'begin'
   if (queue[x].end == queue[i].begin&&visit[i] == 0)
                                ^
0_0_28663387_26007.cpp: In function 'int main()':
0_0_28663387_26007.cpp:73:25: error: too many arguments to function 'void Dfs(int, char)'
            Dfs(i,'b','m');
                         ^
0_0_28663387_26007.cpp:31:6: note: declared here
 void Dfs(int x, char m)
      ^