void main()
{
    vector<int> v;
    v.push_back(1);
    v.push_back(2);
    v.push_back(4);
    v.push_back(3);
    v.push_back(6);
    v.push_back(5);
    cout << v.size() <<endl;
    vector<int>::iterator it;
    for(it = v.begin();it != v.end();)
    {  
        if(*it % 2 == 0)
            //v.erase(it++);
            //it = v.erase(it);
             v.erase(it);
        else
            it++;
    }  
    cout << v.size() <<endl;
    for(it = v.begin();it != v.end();it++)
    {  
        cout << *it << " ";
    }  

    // map的完美刪除
    map<int, int> m;
    m[1] = 1;
    m[2] = 2;
    m[3] = 4;
    m[4] = 3;
    m[5] = 5;
    m[6] = 6;
    cout <<"m size = "<<m.size() <<endl;
    map<int, int>::iterator it1;
    for(it1 = m.begin(); it1!=m.end();)
    {  
        if(it1->second % 2 == 0)
            m.erase(it1++);
        else
            it1++;
    }  
    cout <<"2的整數倍刪除后應該剩下i3";
    cout <<"m size = "<<m.size() <<endl;

}