View Compilation Error

0_0_37075506_417.cpp: In function 'int dfs(char)':
0_0_37075506_417.cpp:24:9: error: return-statement with no value, in function returning 'int' [-fpermissive]
  if(ok) return ;
         ^
0_0_37075506_417.cpp:38:12: error: return-statement with no value, in function returning 'int' [-fpermissive]
     if(ok) return ;
            ^