Erase a vector index

Question

how do i erase the last index of the vector?
https://code.sololearn.com/cSigrAsP7GLj/?ref=app

Answer 1

vec.pop_back();

Answer 2

All vector functions are here: http://www.cplusplus.com/reference/vector/vector/

Answer 3

Try this
vec.erase(vec.end() - 1);
* Vector erase() method:
http://www.cplusplus.com/reference/vector/vector/erase/