c++ STL六大部件

#include <iostream>
#include <vector>
#include <functional>
#include <algorithm>

using namespace std;

int main()
{
    int ia [] = { 10,20,5,55,25 };
    vector<int,allocator<int>> v(ia, ia + 6);
    cout << count_if(v.begin(), v.end(), not1(
        bind2nd(less<int>(), 40)
    )
    );

 
}