#include <bits/stdc++.h>
#include "secret.h"
using namespace std;
typedef long long ll;
typedef pair<int,int> pi;
const int MM = 1e3+5;
int n,a[MM],pre[11][MM],mask[MM];
void rec(int l, int r, int d){
if(l == r) return;
int mid = (l+r)/2;
pre[d][mid] = a[mid];
for(int i = mid-1; i >= l; i--) Secret(pre[d][i+1],a[i]);
pre[d][mid+1] = a[mid+1];
for(int i = mid+2; i <= r; i++) Secret(pre[d][i-1],a[i]);
for(int i = mid+1; i <= r; i++) mask[i] ^= (1<<d);
rec(l,mid,d+1); rec(mid+1,r,d+1);
}
void Init(int N, int A[]){
n = N;
for(int i = 0; i < n; i++) a[i] = A[i];
rec(0,n-1,0);
}
int Query(int L, int R){
if(L == R) return a[L];
int d = __builtin_ctz(mask[L]^mask[R]);
return Secret(pre[d][L],pre[d][R]);
}
/*
int main(){
cin.tie(0)->sync_with_stdio(0);
}*/
