/in/foo.c: In function 'main':
/in/foo.c:27:15: warning: unused variable 'b' [-Wunused-variable]
  int a[10000],b[10000];
               ^
/in/foo.c:26:16: warning: unused variable 'j' [-Wunused-variable]
  int n,i,k=0,x,j=0;
                ^
/in/foo.c:26:10: warning: unused variable 'k' [-Wunused-variable]
  int n,i,k=0,x,j=0;
          ^