Frequently get stuck in corner cases

Hi all, I have been doing cp for quite a long time but what makes me sad is that I always get wrong answers for a few cases and I am not able to figure out which case I have missed. It would be really helpful if you guys give me some tips and tactics on how to think of possible corner cases. Thanks in advances guys. :slight_smile:

My advice is to do this :slight_smile:


Thanks :slight_smile:

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