How does codeforces make money TO KEEP IT RUNNING?

Revision en2, by interestingLSY, 2017-08-03 11:47:59

Codeforces is a popular online judge and I think it needs a lot of money to keep it running.However,I don't see any ads on Codeforces , so how does Codeforces make money?


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en2 English interestingLSY 2017-08-03 11:47:59 19
en1 English interestingLSY 2017-08-03 11:33:14 201 Initial revision (published)