C++ unique

#include <iostream>
#include <algorithm>
#include <list>
#include <iterator>
#include <functional>

using namespace std;

int main()
{
　　int source[] = { 1,2,3,3,3,4,5,6,6,7,8,8,8,9,10,3,6,8,12 };
　　int sourceNum = sizeof(source)/sizeof(source[0]);

　　list<int> list1;
　　list<int> list2;
　　copy(source,source+sourceNum,back_inserter(list1));
　　copy(source,source+sourceNum,back_inserter(list2));

　　list<int>::iterator list_iter1;
　　for (list_iter1 = list1.begin();list_iter1 != list1.end(); ++list_iter1)
　　{
　　　　cout << *list_iter1 << " ";
　　}
　　cout << endl;

　　cout << "----------------------------------------------" << endl;
　　list<int>::iterator list_iter2;
　　list_iter2 = unique(list1.begin(),list1.end());

　　for (list_iter1 = list1.begin();list_iter1 != list_iter2; ++list_iter1)
　　{
　　　　cout << *list_iter1 << " ";
　　}
　　cout << endl;
　　cout << "----------------------------------------------" << endl;

　　list<int>::iterator list_iter3 = unique(list2.begin(),list2.end(),greater<int>());
　　for (list_iter1 = list2.begin(); list_iter1 != list_iter3; ++list_iter1)
　　{
　　　　cout << *list_iter1 << " ";
　　}
　　cout << endl;
　　cout << "----------------------------------------------" << endl;

　　system("pause");
　　return 0;
}

================================================

1 2 3 3 3 4 5 6 6 7 8 8 8 9 10 3 6 8 12
----------------------------------------------
1 2 3 4 5 6 7 8 9 10 3 6 8 12
----------------------------------------------
1 2 3 3 3 4 5 6 6 7 8 8 8 9 10 12
----------------------------------------------
请按任意键继续. . .