It is that I am a TCO15 Marathon Finalist.
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Studying algorithms with books and websites is important, but the most important thing is to compete in contests earnestly.
I have competed in Algorithm since 2011 and in Marathon since 2012. I practiced solving Algorithm problems, but I never became red. In Marathon, I realized that I can get good results if I compete earnestly and spend a lot of time. I became red and advanced to TCO Final in TCO15 Marathon Round 3.