foo.cc: In member function 'int Splay::del(int)':
foo.cc:127:2: warning: control reaches end of non-void function [-Wreturn-type]
  }
  ^
foo.cc: In member function 'int Splay::chajinqu(int, int)':
foo.cc:143:2: warning: control reaches end of non-void function [-Wreturn-type]
  }
  ^

自豪的采用jd5进行评测(github.com/masnn/jd5)