如何通过索引从std :: vector <>中删除元素？

Question

如何通过索引从std :: vector <>中删除元素？

我有一个std :: vector <int>，我想删除第n个元素。我怎么做？

std::vector<int> vec;vec.push_back(6);vec.push_back(-17);vec.push_back(12);vec.erase(???);

Answer 1

要删除单个元素，您可以执行以下操作：std::vector<int> vec;vec.push_back(6);vec.push_back(-17);vec.push_back(12);// Deletes the second element (vec[1])vec.erase(vec.begin() + 1);或者，一次删除多个元素：// Deletes the second through third elements (vec[1], vec[2])vec.erase(vec.begin() + 1, vec.begin() + 3);

Answer 2

这个怎么样？void&nbsp;squeeze(vector<int>&nbsp;&v){ &nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;j&nbsp;=&nbsp;0; &nbsp;&nbsp;&nbsp;&nbsp;for&nbsp;(int&nbsp;i&nbsp;=&nbsp;1;&nbsp;i&nbsp;<&nbsp;v.size();&nbsp;i++) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(v[i]&nbsp;!=&nbsp;v[j]&nbsp;&&&nbsp;++j&nbsp;!=&nbsp;i) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;v[j]&nbsp;=&nbsp;v[i]; &nbsp;&nbsp;&nbsp;&nbsp;v.resize(j&nbsp;+&nbsp;1);}