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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