Hello Codeforces. Can somebody tell me How do you approach a hard problem?,
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Go to the top right and right-click.
nothing happens
That was the intention my friend.
Make simplifying observations about the problem, think of inefficient solutions because they might lead you to an efficient one, invent subtasks of the problem you should focus on, think about some small examples, think of what problems it reminds you of and name some techniques that might be relevant.
These are all things you can do when you're stuck.