foo.cc: In function 'int main()':
foo.cc:7:6: warning: unused variable 'x' [-Wunused-variable]
  int x;
      ^
foo.cc: In function 'void SetInter(int*, int*, int, int)':
foo.cc:37:6: warning: unused variable 'n' [-Wunused-variable]
  int n,x=0;
      ^
foo.cc: In function 'int search(int*, int, int)':
foo.cc:70:1: 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。