Before, I used to spend hours a day thinking about a single problem before giving up, but now I've decided to improve efficiency by limiting myself to 30-40 minutes per problem. Is this too short? How long do you guys spend on problems before giving up-if you give up at all?
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If the problem is interesting for me if feel it is under my solvable range ,I put this problem to my favourite,and keep thinking on it everyday for short until I solve it completely!!
If problem is under my solvable range and seems like i m missing small details or observations or i feel i have tried everything,i see editorial next day!!
If problem is too heavy for my rating,1-2 hour is enough!
Valid strategy.
You should read this blog and this comment
If the method is new to you try 20-30 min and later look at the solution. After 5-10 such problems try to solve the problem no matter what but make sure you do not waste too much time. i.e. try to solve it some other time.