Reference
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Competitive Programming Handbook: https://cses.fi/book/book.pdf
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Awesome competitive programming https://github.com/lnishan/awesome-competitive-programming
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How to find problem on codeforces.com https://youtu.be/xAeiXy8-9Y8?t=41
学习KMP算法 https://www.geeksforgeeks.org/frequency-substring-string/ https://www.geeksforgeeks.org/kmp-algorithm-for-pattern-searching/