#include <bits/stdc++.h>
#include "secret.h"
using namespace std;
typedef long long ll;
const int MAX = 10005;
ll arr[MAX], ret[20][MAX], mask[MAX];
int n;
void init(int l, int r, int dep = 0){
if (l == r) return;
int m = l+(r-l)/2;
for (int i = m; i >= l; i--) ret[dep][i] = (i == m? arr[i] : Secret(arr[i], ret[dep][i+1]));
for (int i = m+1; i <= r; i++) ret[dep][i] = (i == m+1? arr[i] : Secret(arr[i], ret[dep][i-1]));
for (int i = m+1; i <= r; i++) mask[i] ^= (1<<dep);
init(l, m, dep+1); init(m+1, r, dep+1);
}
void Init(int N_, int A[]) {
n = N_;
for (int i = 0; i < n; ++i)arr[i] = A[i];
init(0,n-1,0);
}
int Query(int L, int R) {
int k = __builtin_clz(mask[L] ^ mask[R]);
return Secret(ret[k][L], ret[k][R]);
}
