#include <bits/stdc++.h>

using namespace std;

#define rep(i, n) for(int i = 0; i < (int)n; ++i)
#define FOR(i, a, b) for(int i = a; i < (int)b; ++i)
#define rrep(i, n) for(int i = ((int)n - 1); i >= 0; --i)

using ll = long long;
using ld = long double;

const ll INF = 1e18;
const int Inf = 1e9;
const double EPS = 1e-9;
const int MOD = 1e9 + 7;

template <typename T>
class SegmentTree {
    public:
        int n;
        T e;
        vector<T> node;
        function<T(T, T)> operation;
        function<T(T, T)> process;

        SegmentTree() {}
        SegmentTree(int n_, T e_, function<T(T, T)> operation_, 
            function<T(T, T)> process_) : e(e_), operation(operation_), process(process_) {
            n = 1;
            while (n < n_) n <<= 1;
            node.assign(2 * n, e);
        }

        void build() {
            for (int i = n - 1; i > 0; --i) {
                node[i] = operation(node[i * 2 + 0], node[i * 2 + 1]);
            }
        }

        void set(int idx, T v) {
            node[idx + n] = process(node[idx + n], v);
        }

        void update(int idx, T v) {
            idx += n;
            node[idx] = process(node[idx], v);
            while (idx >>= 1) {
                node[idx] = operation(node[idx * 2 + 0], node[idx * 2 + 1]);
            }
        }

        T query(int a, int b) {
            return query(a, b + 1, 1, 0, n);
        }

        T query(int a, int b, int k, int l, int r) {
            if (a >= r || b <= l) return e;
            if (a <= l && b >= r) return node[k];
            T c = query(a, b, 2 * k + 0, l, (l + r) / 2);
            T d = query(a, b, 2 * k + 1, (l + r) / 2, r);

            return operation(c, d);
        }

        T operator[](int idx) {
            return node[idx + n];
        }
};

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(0);
    int n, q;
    cin >> n >> q;
    SegmentTree<int> seg = SegmentTree<int>(n, 0,
        [](int a, int b) { return a ^ b; }, [](int a, int b) { return b; });
    rep (i, n) {
        int a;
        cin >> a;
        seg.set(i, a);
    }
    seg.build();
    rep (i, q) {
        int l, r;
        cin >> l >> r;
        cout << seg.query(l - 1, r - 1) << endl;
    }
    
    return 0;
}