template <class InputIterator, class Distance>
void advance (InputIterator& it, Distance n);
InputOutput < Forward < Bidirectional < Random Access
map<int, int> mapInts;
...
std::map<int, int>::iterator it = mapInts.begin();
std::advance (it,5);
Q> map.begin 返回的迭代器类型是什么?InputOut,转发,双向?
谢谢