/in/foo.cc: In function 'int dfs(int, int)':
/in/foo.cc:23:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int print(int)':
/in/foo.cc:29:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^