what will erase return if last element is deleted from vector code example

Example 1: remove element by index from vector c++

// Deletes the second element (vec[1])
vec.erase(vec.begin() + 1);

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

Example 2: remove first element from vector c++

// Deletes the first element from vector v
v.erase(v.begin());