func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long MOD = 998244353;   const int MAXN = 1e5 + 10;   const long long mod = (1ll << 32);   const long long inf = 1e16;   const int N = 1e7 + 1;   struct Query {     int l, r, id;   };   Query q[MAXN];   long long a[MAXN], p[MAXN], cntl[N], cntr[N], res[MAXN], K = 1000, k, n, Q;   long long ans = 0;   bool cmp(Query a, Query b) {     if (a.l / K != b.l / K) return a.l < b.l;     return a.r < b.r;   }   void addL(int id) {     cntr[p[id]]++;     cntl[p[id - 1]]++;     ans += cntr[k ^ p[id - 1]];   }   void addR(int id) {     cntr[p[id]]++;     cntl[p[id - 1]]++;     ans += cntl[k ^ p[id]];   }   void delL(int id) {     ans -= cntr[k ^ p[id - 1]];     cntr[p[id]]--;     cntl[p[id - 1]]--;   }   void delR(int id) {     ans -= cntl[k ^ p[id]];     cntr[p[id]]--;     cntl[p[id - 1]]--;   }   void solve() {     cin >> n >> Q >> k;     for (int i = 1; i < n + 1; ++i) {       cin >> a[i];       p[i] = p[i - 1] ^ a[i];     }     for (int i = 0; i < Q; ++i) {       int l, r;       cin >> l >> r;       q[i] = {l, r, i};     }     sort(q, q + Q, cmp);     int L = 1, R = 0;     for (int i = 0; i < Q; ++i) {       int l = q[i].l, r = q[i].r, id = q[i].id;       while (L > l) addL(--L);       while (R < r) addR(++R);       while (L < l) delL(L++);       while (R > r) delR(R--);       res[id] = ans;     }     for (int i = 0; i < Q; ++i) cout << res[i] <<   n ;   }   int main() {     ios::sync_with_stdio(false);     cin.tie(nullptr);     cout.tie(nullptr);     solve();   }   