我们的目的一定要达到，我们的目的一定能够达到！
Dynamic Programming
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Graph Theory
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Computation Geography
Greedy
Mathmatics
Reference
- Colors and Titles: https://codeforces.com/blog/entry/20638
- Rating Calculation: https://codeforces.com/blog/entry/77890
- From 1000 to 2000: https://codeforces.com/blog/entry/53341
- How To Get Better: https://lukipuki.github.io/contest-wiki/get-better.html