TOYOTA SYSTEMS Programming Contest 2022(AtCoder Beginner Contest 279)

E - Cheating Amidakuji

https://atcoder.jp/contests/abc279/tasks/abc279_e

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Codeforces Round #834 (Div. 3)

F. All Possible Digits

https://codeforces.com/contest/1759/problem/F

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LibreOJ10235. 序列统计

https://loj.ac/p/10235

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Codeforces Round #832 (Div. 2)

D. Yet Another Problem

https://codeforces.com/contest/1747/problem/D

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POJ1061. 青蛙的约会

http://poj.org/problem?id=1061

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Educational Codeforces Round 138 (Rated for Div. 2)

D. Counting Arrays

https://codeforces.com/contest/1749/problem/D

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