Has anyone ever been stuck in a problem and doesn't know anyone to ask ? like you feel completely helpless and there is nothing you could do about that. what did you do to overcome that?. maybe this is the other side of being a self-learner :)
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If you are not able to solve it after hours and hours of trying, it means that the problem is above your current level. Just keep training other topics and eventually you will figure out how to solve it
read the editorial if you are completely out of ideas.