Codeforces Global Round 28 B. Kevin and Permutation
https://codeforces.com/contest/2048/problem/BCodeforces Global Round 28 F. Kevin and Math Class
https://codeforces.com/contest/2048/problem/F2025 Multi-University Training Contest 10 G. Message Spreading
https://acm.hdu.edu.cn/showproblem.php?pid=80932025 Multi-University Training Contest 10 L. Counting Colorful Sequence
https://acm.hdu.edu.cn/showproblem.php?pid=8098Pan African Informatics Olympiad 2025 Day 1 D. XOR Multiset
https://qoj.ac/contest/2525/problem/14517Secret Source 登山计划
https://zhengruioi.com/problem/3387
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