foo.cc: In function 'int ghs(int, int)':
foo.cc:7:11: warning: unused variable 'a' [-Wunused-variable]
  int jh=a,a=b,b=jh;
           ^
foo.cc:7:15: warning: unused variable 'b' [-Wunused-variable]
  int jh=a,a=b,b=jh;
               ^
foo.cc: In function 'int zxgbs(int*, int)':
foo.cc:32:9: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return c;
         ^
foo.cc: In function 'int main()':
foo.cc:44:17: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<zxgbs(a,n)<<endl; 
                 ^

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