如何从std :: vector中删除元素<>按指数？ [英] How to erase element from std::vector<> by index?

问题描述

我有一个std :: vector，我想删除第n个元素。我如何做到这一点？

I have a std::vector, and I want to delete the n'th element. How do I do that?

std::vector<int> vec;

vec.push_back(6);
vec.push_back(-17);
vec.push_back(12);

vec.erase(???);

请帮助！

推荐答案

要删除单个元素，您可以：

To delete a single element, you could do:

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：

Or, to delete more then one element at once:

// Deletes the 2nd through 3rd elements (vec[1], vec[2])
vec.erase(vec.begin() + 1, vec.begin() + 3);

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