func_code_string: #include <bits/stdc++.h>   using namespace std;   vector<long long> val(100000 + 5);   struct Gaussian {     long long no_of_bits = 20;     vector<long long> v;     long long set, origsize = 0, redsize = 0;     void push(long long val) {       origsize++;       if (val) v.push_back(val);     }     void clear() {       v.clear();       set = 0, redsize = 0;     }     void eliminate() {       set = redsize = 0;       for (long long bit = 0; bit <= no_of_bits; bit++) {         bool check = false;         for (long long i = redsize; i < v.size(); i++) {           if ((v[i] >> bit) & 1) {             swap(v[i], v[redsize]);             check = true;             break;           }         }         if (check) {           for (long long i = redsize + 1; i < v.size(); i++) {             if ((v[i] >> bit) & 1) v[i] ^= v[redsize];           }           redsize++;         }       }       v.resize(redsize);       for (auto it : v) set |= it;     }     Gaussian& operator=(Gaussian& orig) {       v = orig.v;       set = orig.set;       redsize = orig.redsize;       origsize = orig.origsize;       return *this;     }   };   long long modexpo(long long a, long long b) {     long long res = 1;     while (b > 0) {       if (b % 2) res = (res * a) % 1000000007;       a = (a * a) % 1000000007;       b = b / 2;     }     return res;   }   signed main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long n, q;     cin >> n >> q;     Gaussian arr[n];     val.resize(n);     for (long long i = 0; i < n; i++) cin >> val[i];     arr[0].push(val[0]);     arr[0].eliminate();     for (long long i = 1; i < n; i++) {       arr[i] = arr[i - 1];       arr[i].push(val[i]);       arr[i].eliminate();     }     while (q--) {       long long l, x;       cin >> l >> x;       Gaussian temp = arr[--l];       temp.push(x);       temp.eliminate();       long long ans = 0;       if (temp.redsize == arr[l].redsize)         ans = modexpo(2, arr[l].origsize - arr[l].redsize);       cout << ans <<   n ;     }     return 0;   }   