Hello, can you explain how to solve this problem, please?

Thank you!

Hello, i am newbie and c++ coder, give me an advice, should i learn Python or Java, or both of them or there's no need to learn these languages? Thank you!

Hello everyone! I want to ask one question, is it possible to view full test case? For example it says wrong answer on test case 10, but in the end of test case is '...', is it possible to view full test case? Thank you!

I'm newbie and I'm solving problems in C++, but which one is better c++ or python, should i switch to python or better to stay in C++! Thank you!