#include <iostream>
using namespace std;
 
struct element {
    string ime;
    int broj;
};

struct node {
    element val;
    node *next, *prev;
};
struct DLCL {
    node *head, *tail;
    void init() {
        head = NULL;
        tail = NULL;
    }
    void addFirst(element e) {
        node *new_node = new node;
        new_node->val = e;
        new_node->next = NULL;
        new_node->prev = NULL;
        
        if(head == NULL) {
            head = new_node;
            head->next = head;
            head->prev = head;
            tail = head;
        }
        else {
            new_node->next = head;
            head->prev = new_node;
            new_node->prev = tail;
            head = new_node;
            tail->next = head;
        }
    }
    void addLast(element e) {
        node *new_node = new node;
        new_node->val = e;
        new_node->next = NULL;
        new_node->prev = NULL;
        
        if(head == NULL) {
            head = new_node;
            head->prev = head;
            head->next = head;
            tail = head;
        }
        else {
            tail->next = new_node;
            new_node->prev = tail;
            new_node->next = head;
            head->prev = new_node;
            tail = new_node;
        }
    }
    void deleteFirst() {
        if(head != NULL) {
            if(head -> next == head) {
                delete head;
                head = NULL;
                tail = NULL;
            }
            else {
                node *tmp = head;
                head = head->next;
                head->prev = tail;
                tail->next = head;
                delete tmp;
            }
        }
    }
    void deleteLast() {
        if(head != NULL) {
            if(head->next == head) {
                delete head;
                head = NULL;
                tail = NULL;
            }
            else {
                node *tmp = tail;
                tail = tail->prev;
                tail->next = head;
                head->prev = tail;
                delete tmp;
            }
        }
    }
    void print() {
        node *tmp = head;
        while(tmp != tail) {
            cout << tmp->val.ime << "," << tmp->val.broj << " <--> ";
            tmp = tmp->next;
        }
        cout << tmp->val.ime << "," << tmp->val.broj << " <--> ";
    
    }
};
void fja(DLCL &lista, int br1, int br2, int br3, int br4) {
    node *tmp = lista.head;
    
    while(tmp->val.broj != br1) {
        tmp = tmp->next;
    }
    node *S1 = tmp;
    node *tmps1 = S1;
    tmp = lista.head;
    while(tmp->val.broj != br2) {
        tmp = tmp->next;
    }
    node *S2 = tmp;
    
    DLCL fi, si;
    fi.init();
    si.init();
    
    while(S1 != S2) {
        fi.addLast(S1->val);
        S1 = S1->next;
    }
    
    fi.addLast(S1->val);
    S1 = tmps1;
    fi.print();
    cout << endl;
    
    tmp = lista.head;
    
    while(tmp->val.broj != br3) {
        tmp = tmp->next;
    }
    node *T1 = tmp;
    node *tmpt2 = T1;
    tmp = lista.head;
    while(tmp->val.broj != br4) {
        tmp = tmp->next;
    }
    node *T2 = tmp;
    while(T1 != T2) {
        si.addLast(T1->val);
        T1 = T1->next;
    }
    si.addLast(T1->val);
    T1 = tmpt2;
    si.print();
    cout << endl;
    
    DLCL res;
    res.init();
    tmp = lista.head;
    
    while(tmp != lista.tail) {
        if(tmp == S1) {
            while(si.head != NULL) {
                res.addLast(si.head->val);
                cout << si.head -> val.ime << "<-->";
                si.deleteFirst();
            }
            while(tmp != S2) {
                tmp = tmp->next;
            }
            tmp = tmp->next;

        }
        else if(tmp == T1) {
            while(fi.head != NULL) {
                res.addLast(fi.head->val);
                cout << fi.head -> val.ime << "<-->";

                fi.deleteFirst();
            }
            while(tmp != T2) {
                tmp = tmp->next;
            }
            tmp = tmp->next;
        }
        else {
            res.addLast(tmp->val);
            cout << tmp->val.ime << "<-->";

            tmp = tmp->next;
        }
        
    }
    if(tmp == lista.tail) {
        res.addLast(tmp->val);
        cout << tmp->val.ime<<endl;
    }
//    res.print();
    
    
}
int main()
{
    DLCL dl;
    dl.init();
    
    
    element e;
    e.ime = "Luka";
    e.broj = 5;
    dl.addLast(e);
    
    e.ime = "Ana";
    e.broj = 1;
    dl.addLast(e);
    
    e.ime = "Petar";
    e.broj = 2;
    dl.addLast(e);
    
    e.ime = "Marko";
    e.broj = 6;
    dl.addLast(e);
    
    e.ime = "Mia";
    e.broj = 4;
    dl.addLast(e);
    e.ime = "Tea";
    e.broj = 8;
    dl.addLast(e);
    
    e.ime = "Boban";
    e.broj = 10;
    dl.addLast(e);
    
    
    fja(dl, 1, 6, 4, 8);
    
    
 
    return 0;
}