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vector<int>::iterator i;
vector<int>::iterator *it = new vector<int>::iterator;
for(*it = vec->begin(); *it != vec->end(); (*it)++)
{
if (**it == 15)
{
i = *it;
vec->erase(i);
// *it = vec->begin();
cout<<"after erase 5 the iterator is "<<**it<<endl;//这行代码会崩溃