Read the following instructions carefully Run the following

Read the following instructions carefully

Run the following code and explain how it works. Append your run results to your answer.

//deque Demo
#include <iostream>
#include <list>
#include <algorithm>
#include <deque>
#include <string>

using namespace std;

template<class T>
void printDeque(const deque<T>& lst, string s) {
    cout << s << \": \";
    typename deque<T>::const_iterator i = lst.begin();
    for ( ; i != lst.end(); i++)
         cout << *i << \' \';
    cout << endl;
}

int main() {
    deque<int> dq1;
    dq1.push_front(1);        
    dq1.push_front(2);        
    dq1.push_back(3);         
    dq1.push_back(4);         
    printDeque(dq1,\"dq1\");
    deque<int> dq2(dq1.begin()+1,dq1.end()-1);     
    dq1[1] = 5;    
    dq1.erase(dq1.begin());
    dq1.insert(dq1.end()-1,2,6);
    sort(dq1.begin(),dq1.end());
    deque<int> dq3;
    dq3.resize(dq1.size()+dq2.size());
    merge(dq1.begin(),dq1.end(),dq2.begin(),dq2.end(),dq3.begin());
    printDeque(dq1,\"dq1\");
    printDeque(dq2,\"dq2\");    
    printDeque(dq3,\"dq3\");    
    return 0;
}

Solution

run results: