How to Delete Elements from a std::vector by Index?

Deleting Elements from std::vector by Index

Query:

How do I delete specific elements from a std::vector based on their index values?

Approach:

To erase elements from a std::vector by index, utilize the erase function. This function requires iterators specifying the starting and ending points of the elements to be removed.

Solution:

Deleting a Single Element:

To delete a single element at a specific index, employ the following approach:

vec.erase(std::next(vec.begin(), n));

Where:

• vec represents the std::vector.
• n is the index of the element to be deleted (indexing starts from 0).

Deleting Multiple Elements:

For deleting multiple consecutive elements, provide an additional iterator to the erase function, defining the end point:

vec.erase(std::next(vec.begin(), startIndex), std::next(vec.begin(), endIndex));

Where:

• vec is the std::vector.
• startIndex is the index of the first element to be deleted.
• endIndex is the index of the last element to be deleted (inclusive).

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