Here is the specification of the grader system.

Machine

• DigitalOcean CPU-optimized dedicated droplet, Intel Xeon Skylake 2 cores @ 2.7 GHz
• 4 GB RAM
• Ubuntu 18.04.3 LTS

C++ compiler

• g++ 7.5.0
• Compilation command: g++ -std=c++11 -o solution solution.cpp -O2 -lm

Java compiler

• OpenJDK javac 1.8.0_252
• Compilation command: javac <filename>