????3.?????????
????????????±???????vector??????????????????????????????????????????????????????????????????????????????????
????1.??????iterator????
???????????????????????????????????????vector??
????vector<int> ::iterator iter;???????iter??
????2.begin??end????
???????????????????????????begin??end?????????????????????????????????????????begin???????????????????
????vector<int>::iterator iter=v.begin();
??????v??????iter???v[0]??
??????end?????????????????????????????????????v????begin??end??????????
????*iter=0;
????iter++???????????????????λ??
????????v[0]????0????end????????????н??????
????==??!=????????????????????????????????????????????????????????????????
????????????t?????
????for(vector<int>::iterator iter=v.begin();iter!=v.end();iter++)
????*iter=0;
??????vector?е???????????0??