/in/foo.cc: In function 'int main()':
/in/foo.cc:46:42: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
  for(i=0;i<n;i++)scanf("%d%d",&a[i],&b[i]);
                               ~~~~~      ^
/in/foo.cc:46:42: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'long long int*' [-Wformat=]
/in/foo.cc:43:17: warning: variable 'k' set but not used [-Wunused-but-set-variable]
 long long n,i,j,k,a[1000],b[1000],ans[4001],tmp[4001],ttt[4001],p,q;
                 ^