C++用list实现排序(C++11)

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#include <iostream>
#include <deque>
#include <list>
using   namespace   std;
std::ostream& operator<<(std::ostream& ostr, const std::list<int>& list)
{
    for (auto &i : list) {
        ostr << " " << i;
    }
    return ostr;
}
int     main()
{

    list<int>   l={3,2,1,6,8,0,1,5,9};
    l.sort(); //默认从小到大排序
    cout << l << endl;
    l.sort(greater<int>()); //从大到小排序
    cout << l << endl;
    return 0;
}