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Need hard problems for practice

Revision en2, by sp937, 2017-09-20 12:31:04

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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  Rev. Lang. By When Δ Comment
en2 English sp937 2017-09-20 12:31:04 2 Tiny change: 'blems on do, graphs, ' -> 'blems on dp, graphs, '
en1 English sp937 2017-09-20 12:30:26 456 Initial revision (published)