how to reach stable pupil?
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In my experience, good level of logic and knowledge of some basics algorithm enough for stable pupil.
knowledge of some basics algorithm, which algorithm basics?
Brute force, binary search, greedy (usually with sortings), basic number theory (and math), dp, constructive algorithms. Most Div2 AB only need to these algorithm. These are the most basic algorithm. If you want to be Specialist or Expert, you need to learn more algorithm and improve your ability on solving problems.
Is there any good mashup or contest to practise in these topics ?
Maybe you can google it and find some blogs about them.
lol you don't need dp for stable pupil, dp can be div2C but I don't think I have ever seen a div2 A or B be dp
Bro at least touch pupil once?