Tips to be a competitive programming & increase your problem solving skills (Sorry for bad quality))
In this video, I give some tips that I see useful to be a competitive programmer.
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Certainly there are a lot better videos dealing with he same topic.
Here I give just my opinion, it is not guideline or rules.
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OJs
https://www.hackerrank.com
https://leetcode.com
https://codeforces.com