C++ Code meaning in Python

Problems and Contests
#1

What does this line of code (c++) mean?

vector<int> new_B1 = B1; new_B1.erase(new_B1.begin() + i);

This is from Contest Results (2018 Bronze December #3, back and forth).
What does the above line of code do to the list new_B1?

Thanks!

#2

Google it (“vector erase C++”).