This contest is an online contest and will take place in Geeks for Geeks.

No, it is free of cost.

To participate in this challenge, do the following:
a. Register for the challenge
b. Visit the challenge page on start date/time
c. Click Participate in Challenge

Yes, the programming questions are restricted to some languages. You can answer only in C++, Java and Python.

An online judge is a code checker and not a human being. The code checker or "judge" tests your code automatically.
Therefore, you must write your code accordingly. For each problem, based on the specifications mentioned in the problem statement, there will be one or more input files and corresponding (correct) output files.
The program that you create is run on each of the input files and the corresponding output must match the (correct) output files in order.
Your program will be marked incorrect in the following cases:
Output files (generated by running your code) do not match the pre-generated output files Output files (generated by running your code) matches all the pre-generated output files, however, it is not in the order in which the pre-generated output files are arranged.

You can make as many submissions as you want until the time runs out, the best submission will be considered for the evaluation but every wrong submission will led to 5% penalty.