/in/foo.c: In function 'main':
/in/foo.c:5:8: warning: too many arguments for format [-Wformat-extra-args]
  scanf("%d",&n,&k);
        ^~~~
/in/foo.c:4:30: warning: unused variable 'b' [-Wunused-variable]
  int k,n,m,s=1,a[100010]={0},b[100010]={0};
                              ^