STL 容器

#include <iostream>using namespace std;#include <list>     int main(){list<int> l1;int a[5] = {3,5,6,7,9};list<int> l2(a, a+5);cout << "l1.size():" << l1.size() << endl;cout << "l2.size():" << l2.size() << endl;list<int>::iterator it;for (it=l2.begin(); it!=l2.end(); it++)cout << *it << ' ';cout << endl; it = l2.begin();it++;l2.erase(it); l2.insert(l2.begin(),100);l2.insert(l2.end(),200);for (it=l2.begin(); it!=l2.end(); it++)cout << *it << ' ';cout << endl; return 0;}