How to Remove an Element from a std::vector by Index in C ?

Erasing an Element from a std::vector by Index

In C , when working with a std::vector, there may be instances where removing an element by its index is necessary.

Consider a scenario where you have a vector of integers and need to delete the nth element.

Solution:

To delete a single element at position n, simply use std::erase with an iterator to the desired position. Here's how you would do it:

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()));

std::next(vec.begin()) returns an iterator to the second element, which is then erased.

If you want to delete multiple consecutive elements, use erase with a range of iterators:

// Deletes the second through third elements (vec[1], vec[2])
vec.erase(std::next(vec.begin(), 1), std::next(vec.begin(), 3));

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