Exer10_33.cpp

#include <fstream>
#include <vector>
#include <iterator>
#include <algorithm>
using std::cerr;
using std::endl;
using std::vector;
using std::ifstream;
using std::ofstream;
using std::istream_iterator;
using std::ostream_iterator;
int main(int argc, char *argv[])
{
    if(argc != 4)
    {
        cerr << "Wrong input!" << endl;
        return -1;
    }
    ifstream is(argv[1]);
    ofstream out_odd(argv[2]), out_even(argv[3]);
    istream_iterator<int> in_iter(is), eof;
    ostream_iterator<int> odd_iter(out_odd, " ");
    ostream_iterator<int> even_iter(out_even, "\n");
    vector<int> vec(in_iter, eof);
    auto even = partition(vec.begin(), vec.end(), [](const int &i){return i % 2;});
    copy(vec.begin(), even, odd_iter);
    copy(even, vec.end(), even_iter);
    return 0;
}