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Algorithm
I have implemented some algorithms in copypasta.
How to Practice
Starting from problems with difficulty equal to ("Your rating" + 200), you will be solving problem that will be quite hard for you.
Spend no more than 10 minutes before look at the solution.
Train on constructive problems ("constructive algorithms" tag on CF) will significantly improve the time you spend on finding observations.
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Codeforces: Problem Difficulties