func_code_string: #include <cstdio>   #include <cassert>   #include <utility>   #include <functional>   #define X first   #define Y second   const int mod = 998244353;   template<int k>   struct node{     node <k-1>* chd[2];     int cnt;     int lazy;     int has[2];     int get_cnt(){       assert(this!=NULL);       return cnt;     }     int get_has(int d){       assert(this!=NULL);       push();       assert(has[d]<(1<<(k+1)));       return has[d];     }     node():chd{NULL, NULL}, has{0, 0}, cnt(0),lazy(0){};     node(node<k-1>* l,node <k-1>* r):chd{l,r},cnt(0),lazy(0),has{0,0}{       if(l){         cnt+=l->get_cnt();         has[0]|=l->get_has(0)|(1<<k);         has[1]|=l->get_has(1);       }       if(r){         cnt+=r->get_cnt();         has[0]|=r->get_has(0);         has[1]|=r->get_has(1)|(1<<k);       }       assert(has[0]<(1<<(k+1)));       assert(has[1]<(1<<(k+1)));     }     void push(){       assert(lazy<(1<<(k+1)));       if(!lazy) return;       if(lazy&(1<<k)){         std::swap(chd[0],chd[1]);         if((has[0]^has[1])&(1<<k)){    has[0]^=(1<<k);    has[1]^=(1<<k);         }         lazy^=(1<<k);       }       int flip=(has[0]^has[1])&lazy;       has[0]^=flip;       has[1]^=flip;       if(chd[0]) chd[0]->lazy^=lazy;       if(chd[1]) chd[1]->lazy^=lazy;       lazy=0;       assert(has[0]<(1<<(k+1)));       assert(has[1]<(1<<(k+1)));     }   };      template<>   struct node<-1>{     int lazy;     node():lazy(0){     }     int get_cnt(){       assert(this!=NULL);       return 1;     }     int get_has(int d){       assert(this!=NULL);       return 0;     }   };      template<int k>   node<k>* create(int x){     if(x&(1<<k)){       return new node<k>(NULL,create<k-1>(x));     }else{       return new node<k>(create<k-1>(x),NULL);     }   }   template<> node<-1>*create(int x)   {       return new node<-1>();   }   template<int k> std::pair <node<k - 1>*, node< k - 1>*> destruct(node <k>*a)   {     assert(a!=NULL);       a -> push();       auto res = std::make_pair(a -> chd[0], a -> chd[1]);       delete a;       return res;   }   template <int k> node <k>* join(node<k -1>* l, node <k - 1>* r)   {       if(l == NULL && r == NULL)       {           return NULL;       }       return new node<k>(l, r);   }   template<int k> node<k>* merge(node<k> *a, node<k> *b)   {       if(!a)       {           return b;       }       if(!b)       {           return a;       }       auto aa = destruct(a);       auto bb = destruct(b);       node <k - 1> *l = merge<k - 1>(aa.X, bb.X);       node <k - 1> *r = merge<k - 1>(aa.Y, bb.Y);       return join<k>(l, r);   }   template<>node<-1>* merge(node<-1>*a, node<-1>* b)   {       if(!a)       {           return b;       }       if(!b)       {           return a;       }       delete b;       return a;   }   template<int k>   std::pair<node<k>*,node<k>*> split(node<k>* a,int thres){     if(a==NULL){       return {NULL,NULL};     }     if(thres<=0) return {NULL,a};     if(thres>=(1<<(k+1))) return {a,NULL};     assert(k>=0);     auto aa =destruct(a);     if(thres<(1<<k)){       node<k-1>* l,*r;       std::tie(l,r)=split<k-1>(aa.first,thres);       return std::make_pair(join<k>(l,NULL),join<k>(r,aa.second));     }else if(thres>(1<<k)){       node<k-1>* l,*r;       std::tie(l,r)=split<k-1>(aa.second, thres-(1<<k));       return std::make_pair(join<k>(aa.first,l),join<k>(NULL,r));     }else{       return std::make_pair(join<k>(aa.first,NULL),join<k>(NULL,aa.second));     }   }      template<>   std::pair<node<-1>*,node<-1>*> split<-1>(node<-1>* a,int thres){     assert(0);   }   template<int k> node<k>* update(node<k> *a, int val)   {       if(a == NULL) return NULL;       a -> push();     assert(val<(1<<(k+1)));       if((val & a -> has[0] & a -> has[1]) == 0)       {           a -> lazy ^= (val & a ->has[0]);           return a;       }       node<k - 1>*l, *r;       std::tie(l, r) = destruct(a);       l = update<k - 1>(l, val & ~(1 << k));       r = update<k - 1>(r, val & ~(1 << k));       if(val & (1 << k))       {           return join<k>(NULL, merge<k - 1>(l, r));       }       else       {           return join<k>(l, r);       }   }   template<>node<-1>*update(node<-1>*a, int val)   {       return a;   }      int main()   {     //  ifstream cin( input1.txt.4c );   //    ios_base::sync_with_stdio(0);     //  cin.tie(0);       //cout.tie(0);       node<19>* root = NULL;       int n, q;       //cin >> n >> q;       scanf( %d %d , &n, &q);      // printf( A n );       for(int i = 0; i< n; i++)       {           int a;           scanf( %d , &a);         //  root = create<19> (a);           root = merge(root, create<19>(a));       }       while(q--)       {           int t, l, r;           scanf( %d%d%d , &t, &l, &r);           node<19>*left, *right;           std::tie(left, root) = split(root, l);           std::tie(root, right) = split(root, r + 1);           if(t == 4)           {               if(root)               {                   printf( %d n , root -> cnt);                  // return 0;               }               else               {                   printf( 0 n );                   //return 0;               }           }           else           {               int x;               scanf( %d , &x);               if(root != NULL)               {                   if(t == 1)                   {                       root -> lazy ^= ((1 << 20) - 1);                       root = update(root, x ^ ((1 << 20) - 1));                       root -> lazy ^= ((1 << 20) - 1);                   }                   else if(t == 2)                   {                       root = update(root, x);                   }                   else                   {                       root -> lazy ^=x;                   }               }           }           root = merge(root, left);           root = merge(root, right);       }       return 0;   }   