#include<bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
using ll=long long;
using ul=unsigned long long;
using ld=long double;
using mint = modint1000000007;
int dx[8] = {-1, 1, 0, 0, -1, -1, 1, 1};
int dy[8] = {0, 0, -1, 1, -1, 1, -1, 1};
using Graph=vector<vector<int>>;
ll op(ll a,ll b){
    return (a^b);
}
ll e(){
    return 0ll;
}
int main(){
    ll N,Q;
    cin>>N>>Q;
    segtree<ll,op,e>seg(N);
    for(int i=0;i<N;i++){
        ll a;
        cin>>a;
        seg.set(i,a);
    }
    while(Q--){
        ll x,y;
        cin>>x>>y;
        x--;
            cout<<seg.prod(x,y)<<endl;
    }
}