Hi everyone, I am able do problems on dp, graphs, strings. And I even learnt suffix arrays recently. I want to become even more stronger in competitive programming. I want to solve hard problems on sgu specifically. But I am not able to find any problem classifiers anywhere. Can anyone suggest me some hard problems on sgu? Hard in the sense I mean those which can't be solved by a purple or yellow coder. Thanks in advance.
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you can try here: https://a2oj.com/category?ID=412
Only 5 problems are there in that link and that too easy one's.
http://codeforces.com/problemset/page/36?order=BY_SOLVED_DESC
You're welcome.