func_code_string: #include <bits/stdc++.h>   using namespace std;   class qry {    public:     int l, r, idx;     qry(int l, int r, int idx) : l(l), r(r), idx(idx) {}   };   int a[500001], n, m, res[500001];   vector<qry> q;   int getans(vector<int> b) {     int res = 0;     for (int i = 0; i < b.size(); i++) {       if ((res ^ b[i]) > res) res ^= b[i];     }     return res;   }   void ins(vector<int>& b, int x) {     for (int i = 0; i < b.size(); i++) {       if ((b[i] ^ x) < x) x ^= b[i];     }     if (!x) return;     int t = 31 - __builtin_clz(x);     for (int i = 0; i < b.size(); i++) {       if (b[i] & (1 << t)) b[i] ^= x;     }     b.push_back(x);   }   vector<int> merge(vector<int>& a, vector<int>& b) {     vector<int> ret = a;     for (int i = 0; i < b.size(); i++) ins(ret, b[i]);     return ret;   }   void solve(vector<qry>& q, int L, int R) {     if (q.empty()) return;     if (q.size() <= 3 || R - L <= 3) {       for (int i = 0; i < q.size(); i++) {         int l = q[i].l, r = q[i].r;         vector<int> bs;         for (int j = l; j <= r; j++) ins(bs, a[j]);         res[q[i].idx] = getans(bs);       }       return;     }     vector<qry> l, r, my;     int mid = (L + R) / 2;     for (int i = 0; i < q.size(); i++) {       if (q[i].r <= mid)         l.push_back(q[i]);       else if (q[i].l >= mid + 1)         r.push_back(q[i]);       else         my.push_back(q[i]);     }     solve(l, L, mid);     solve(r, mid + 1, R);     sort(my.begin(), my.end(), [](const qry& i, const qry& j) {       if (i.l != j.l)         return i.l > j.l;       else         return i.r < j.r;     });     vector<int> lb;     int cur = 0, pt = mid;     vector<vector<int> > rb;     vector<int> t;     for (int i = mid + 1; i <= R; i++) {       ins(t, a[i]);       rb.push_back(t);     }     while (cur < my.size()) {       bool found = false;       while (my[cur].l <= pt) {         found = true;         ins(lb, a[pt--]);       }       res[my[cur].idx] = getans(merge(lb, rb[my[cur].r - mid - 1]));       cur++;     }   }   int main() {     scanf( %d , &n);     for (int i = 1; i <= n; i++) scanf( %d , &a[i]);     scanf( %d , &m);     for (int i = 1; i <= m; i++) {       int l, r;       scanf( %d %d , &l, &r);       q.push_back(qry(l, r, i));     }     solve(q, 1, n);     for (int i = 1; i <= m; i++) printf( %d n , res[i]);     return 0;   }   