Recently, i heard that codechef is a good problems source,so can you share me some nice medium-hard problem on codechef ? Thank you for any helps you can provide
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This may help you..
Medium Category Problems
Hard Category Problems
Thank you so much for helping me. But you know, codeforce is also a good problem source but not always and maybe so does codechef, there will be some not-very-nice problem that many people don't like it and some awesome problems that's everybody like it. So i want to do some second type problem.
Link
I found this problem pretty interesting, but it might be easy for you. You can give it a try.
Interesting problem ! Thank you.