#include<secret.h>
int pref[1005][1005],n,mask[1005];
void dnc(int l,int r,int level,int a[])
{
if(l==r) return;
int mid=(l+r)>>1;
pref[mid][mid]=a[mid];
pref[mid+1][mid+1]=a[mid+1];
for(int i=mid+2;i<=r;i++) pref[mid+1][i]=Secret(pref[mid+1][i-1],a[i]);
for(int i=mid-1;i>=l;i--) pref[mid][i]=Secret(pref[mid][i+1],a[i]);
for(int i=mid+1;i<=r;i++) mask[i]|=(1<<level);
if(l<mid) dnc(l,mid,level+1,a);
if(mid+1<r) dnc(mid+1,r,level+1,a);
}
void Init(int N,int A[])
{
dnc(0,N-1,0,A);
}
int Query(int L,int R)
{
int k=__builtin_ctz(mask[L]^mask[R]);
return Secret(pref[k][L],pref[k][R]);
}
