std::vector<int> v;
v.push_back(0);
v.push_back(1);
v.push_back(2);
v.push_back(3);
v.push_back(4);
v.push_back(5);
v.push_back(6);
v.push_back(7);
v.push_back(8);
v.push_back(9);

unsigned int j = 0;
int size = v.size();
for(unsigned int i=0; i< size; i++)
{
    if(i%2 == 0)
    {
        v.erase(v.begin() + i - j);
        j++;
    }
}
cout << "after remove"<< endl ;
for(unsigned int i=0; i < v.size(); i++)
    cout << v[i] <<"   ";

结果是 1 3 5 7 9

常见iterator自增，如果多增加，可能报错

std::vector<int> v;
v.push_back(0);
v.push_back(1);
v.push_back(2);
v.push_back(3);
v.push_back(4);

for(vector<int>::iterator it=v.begin(); it != v.end(); it++)
{
    it = it + 5;
        cout << *it << endl;
}

这样的程序是错的，会越界。 应该改成这样

for(vector<int>::iterator it=v.begin(); it != v.end(); it++)
{
    int step = v.end() - it;
    it = it+step/5;
    cout << *it << endl;
}