# Re: copy some elements of a vector in reverse order

From:
Ondra Holub <ondra.holub@post.cz>
Newsgroups:
comp.lang.c++
Date:
Sat, 18 Aug 2007 00:09:42 -0700
Message-ID:
On 18 Srp, 07:28, tom <pxk...@gmail.com> wrote:

Question:
Give a vector that has 10 elements, copy the elements from position 3
through 7 in reverse order to a list
I have a solution in the below, but I'm feel there could be a better
one, (just not quite confident with this one)

==========
#include <iostream>
#include <vector>
#include <hash_map>
#include <cctype>
#include <cassert>
#include <fstream>
#include <sstream>
#include <list>
#include <deque>
#include <algorithm>
#include <numeric>
#include <stack>
#include <queue>
#include <map>
#include <set>

using namespace std;
using namespace stdext;

int main(int argc, char *argv[])
{
vector<int> intVector;
for(int i=0; i<10; i++)
{
intVector.push_back(i);
}

list<int> intList;
for(int i=3; i<=7; ++i)
{
intList.push_front(intVector[i]);
}

ostream_iterator<int> oiter(cout, " ");
list<int>::const_iterator iter = intList.begin();
while(iter!=intList.end())
{
*oiter++ = *iter++;
}

return 0;

}

Or you can initialize list already in constructor, but you need
convert forward iterators to reverse_iterators:

list<int> intList(
vector<int>::reverse_iterator(intVector.begin() + 7 + 1),
vector<int>::reverse_iterator(intVector.begin() + 3)
);

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