Since January, 2010 there is a new standard in Brazil, which is different from all over the world, but it might be the world standard in a few years.
Nevertheless, most hotels and buildings older than 2010 still use the previous standard, which was either A, B or C! The safest thing to do is to bring a Universal plug converter. Information on this subject might be updated when we have more precise information about the hotels and plug types that they use.
For the comparison sockets table, check here.