List 74 (7) (IRA)

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <algorithm>
#include <stack>
#include <queue>
#include <list>
using namespace std;


ifstream fin("input.txt");


int main()
{
    /*
    1 2 2 3 3 3 4 4 4 4
    */
    list<int> l;
    while (fin.peek() != EOF)
    {
        int cur;
        fin >> cur;
        if (l.empty())
            l.push_back(cur);
        if (cur != l.back())
            l.push_back(cur);
    }
    while (!l.empty())
    {
        int cur = l.front();
        l.pop_front();
        cout << cur << ' ' ;
    }
    cout << endl;
}