STL的六大组件

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

int main() {
    vector<int, std::alloctor<int>> c {40, 11, 45, 23};
    cont << count_if(c.begin(), c.end(), notl(bind2nd(less<int>(), 40)));   return 0;
}