GraalVM offers substantial performance benefits over HotSpot for the Java developers out there.
Can we get GraalVM CE as an option?
https://www.fineconstant.com/posts/comparing-jvm-performance/
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Example submission that could have succeeded in C++ but timed out in Java:
https://codeforces.com/contest/1697/submission/160345089
Very easy problem. Very standard solution.
You probably want to use buffered input and output.