Hello I am new to USACO and now I have heard that USACO will be using standard input and output. Would that signify that we use input/output methods like cin >> and cout << in c++, or Scanner class in Java. So should I be practicing in Scanner class for Java or if using c++ use cin and cout? What was the old method such as printing to file? Thank you very much, your help is greatly appreciated

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The old method was file IO, yes.
In Java, BufferedReader is still recommended due to being much faster than Scanner.

Thank you very much for the clarification.