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Insert the remaining elements from the vector between the first and last deque elements

#include <iostream> #include <deque> #include <vector> using namespace std; const int SIZE = 100; double sum(const deque<double> &dq) {    deque<double>::const_iterator p;    double s = 0;    for (p=dq.begin(); p != dq.end(); ++p)       s += *p ;    return s; } int main() {   vector<double> vec(SIZE, 0);      deque<double> deq;                int i;   double sumTotal;                                     for(i = 0; i < SIZE; i++){      vec[i] = i * 0.6; cout << vec[i] << endl;   }     deq.push_front(vec.front());      deq.push_back(vec.back());       deq.insert(deq.begin()+1, vec.begin()+1, vec.end()-1);     sumTotal = sum(deq);     cout << "sum:" << sumTotal; }