In case you remember,
there lived a legendary coder named "Harsha Suryanarayana", popularly known as "Humblefool"
from India. He died in a car accident back in 2014.

The only thing that still keeps me wondering is why he always chose to code in Java( in coding competitions ) even though he knew C++ along with STL and was also aware of the advantages of using C++ over Java in competitive coding.

@atheist that would depend on the competition.

Code golf is about code size and not speed, others are about creating things fast and java is more forgiving than c++ in many cases.

So it all depends.

@atheist you probably are not a competitive programmer

@atheist Same here.

For the first team competitions we've used C++, then we realized Python is way faster to code in, if you just need to hack something together.

Also, it quite depends on the type of competition. Here, where I live, the most common competitions require you to upload your output. But there are some other competitions where you need to upload the source code and let the other system compile at run it. Then you are not even able to decide the language, your are bound to one.