VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only)

B. Work Group

https://codeforces.com/problemset/problem/533/B

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2023牛客暑期多校训练营2

K - Box

https://ac.nowcoder.com/acm/contest/57356/K

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“范式杯”2023牛客暑期多校训练营1

L - Three Permutations

https://ac.nowcoder.com/acm/contest/57355/L

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“范式杯”2023牛客暑期多校训练营1

H - Matches

https://ac.nowcoder.com/acm/contest/57355/H

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Codeforces Round 877 (Div. 2)

D. Bracket Walk

https://codeforces.com/contest/1838/problem/D

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Educational Codeforces Round 149 (Rated for Div. 2)

D. Bracket Coloring

https://codeforces.com/contest/1837/problem/D

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