/in/foo.cc: In function 'int dfs(int)':
/in/foo.cc:36:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int handle()':
/in/foo.cc:45:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^