Remove duplicates

20121119.cpp

#include <iostream>
#include <iterator>
#include <algorithm>
#include <vector>
using namespace std;

int main()
{
    vector<int> vec((istream_iterator<int>(cin)), istream_iterator<int>());
    copy(vec.begin(), unique(vec.begin(), vec.end()), ostream_iterator<int>(cout, "\n"));
}

input.txt

1
2
2
2
3
4
4
5
6
6
6
6
7
7
8

output.txt

$ g++ -Wall -Wextra -Werror -pedantic -O2 20121119.cpp -o 20121119

$ ./20121119 <input.txt
1
2
3
4
5
6
7
8