>
>
> > I notice "operator[](i)" is used in the interesting,
>
> With std::vector, you could also use array.at(i), which is equivalent.
>
>
vector::at will do a runtime check if the index is out of bounds, in that
case it throws
an exception.

vector::operator[] will not do this check, causing undefined behavior when
accessing
elements out of bounds.

Nicky
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