Codeforces Round 315 (Div. 1)

A. Primes or Palindromes?

https://codeforces.com/contest/568/problem/A

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Codeforces Round 887 (Div. 2)

C. Ntarsis' Set

https://codeforces.com/contest/1853/problem/C

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CodeTON Round 4 (Div. 1 + Div. 2, Rated, Prizes!)

D. Climbing the Tree

https://codeforces.com/contest/1810/problem/D

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AtCoder Regular Contest 155

B - Abs Abs Function

https://atcoder.jp/contests/arc155/tasks/arc155_b

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Codeforces Round #844 (Div. 1 + Div. 2, based on VK Cup 2022 - Elimination Round)

D. Many Perfect Squares

https://codeforces.com/contest/1782/problem/D

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Codeforces Round #841 (Div. 2) and Divide by Zero 2022

C. Even Subarrays

https://codeforces.com/contest/1731/problem/C

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