How do I erase an element from std::vector<> by index?

Question

How do I erase an element from std::vector<> by index?

I have a std::vector<int>, and I need to erase the n'th element. How would I do that?

std::vector<int> vec;



vec.push_back(6);

vec.push_back(-17);

vec.push_back(12);



vec.erase(???);

vector stl cpp

3 years ago by vishaljlf39

2 Answers

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**akshay1995** · Answer 1 · 2021-05-29T08:44:47

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(std::next(vec.begin()));

Or, to delete more than one element at once:



// Deletes the second through third elements (vec[1], vec[2])

vec.erase(std::next(vec.begin(), 1), std::next(vec.begin(), 3));

**RoliMishra** · Answer 2 · 2021-05-31T12:12:05

The erase method will be used in two ways:

Erasing single element:

vector.erase( vector.begin() + 3 ); // Deleting the fourth element

Erasing range of elements:

vector.erase( vector.begin() + 3, vector.begin() + 5 ); // Deleting from fourth element to sixth element

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How do I erase an element from std::vector<> by index?

2 Answers

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