http://www.cplusplus.com/reference/stl/vector/at/
The difference between this member function and member operator function operator[] is that vector::at signals if the requested position is out of range by throwing an out_of_range exception.
http://www.cplusplus.com/reference/stl/vector/at/
The difference between this member function and member operator function operator[] is that vector::at signals if the requested position is out of range by throwing an out_of_range exception.
Amaro C++, il gusto pieno dell'undefined behavior.
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