func_code_string: #include <bits/stdc++.h>   using namespace std;   int arr[300005], key[300005];   struct node {     int cnt;     struct node *zero, *one;     node() {       cnt = 0;       zero = NULL, one = NULL;     }   } * root;   void Insert(int pat) {     struct node *curr = root;     int on = 1;     for (int i = 30; i >= 0; i--) {       int bit = (pat & (on << i));       if (bit) {         if (curr->one == NULL) curr->one = new node();         curr = curr->one;         curr->cnt++;       } else {         if (curr->zero == NULL) curr->zero = new node();         curr = curr->zero;         curr->cnt++;       }     }   }   void Search(int val) {     struct node *curr = root;     int on = 1;     long long int ans = 0;     for (int i = 30; i >= 0; i--) {       int bit = (val & (on << i));       if (bit) {         if (curr->one != NULL && curr->one->cnt > 0) {           curr = curr->one;           curr->cnt--;         } else if (curr->zero != NULL && curr->zero->cnt > 0) {           curr = curr->zero;           curr->cnt--;           ans += (on << i);         }       } else {         if (curr->zero != NULL && curr->zero->cnt > 0) {           curr = curr->zero;           curr->cnt--;         } else if (curr->one != NULL && curr->one->cnt > 0) {           curr = curr->one;           curr->cnt--;           ans += (on << i);         }       }     }     cout << ans <<    ;   }   int main() {     int n;     cin >> n;     root = new node();     for (int i = 1; i <= n; i++) cin >> arr[i];     for (int i = 1; i <= n; i++) {       cin >> key[i];       Insert(key[i]);     }     for (int i = 1; i <= n; i++) {       Search(arr[i]);     }     return 0;   }   