foo.cc:18:28: error: ISO C++ forbids declaration of 'Search' with no type [-fpermissive]
  Search(int n,int x,int a[])
                            ^
foo.cc: In function 'int Search(int, int, int*)':
foo.cc:26:2: warning: control reaches end of non-void function [-Wreturn-type]
  }
  ^

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。