практика_лист1_12

#include <fstream>
#include <list>

using namespace std;

int main()
{
    ifstream in("input.txt");
    ofstream out("output.txt");

    list <int> myList;
    int n;
    while(in >> n)
    {
        myList.push_back(n);
    }
    int count = 0;
    for(list<int>::iterator iter = myList.begin(); iter != myList.end(); iter++)
    {
        if (*iter > 0)
        {
            iter = myList.insert(iter, 0);
            advance(iter, 2);
            iter = myList.insert(iter, 0);
            count ++;
            break;
        }
    }
    if (count == 0)
        out << "There is not positive numbers!" << endl;
    while(!myList.empty())
    {
        out << myList.front() << " ";
        myList.pop_front();
    }

    in.close();
    out.close();

    return 0;
}