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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AtCoder Regular Contest 153

C - ± Increasing Sequence

https://atcoder.jp/contests/arc153/tasks/arc153_c

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AtCoder Regular Contest 153

B - Grid Rotations

https://atcoder.jp/contests/arc153/tasks/arc153_b

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AtCoder Beginner Contest 284

F - ABCBAC

https://atcoder.jp/contests/abc284/tasks/abc284_f

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Hello 2023

C. Least Prefix Sum

https://codeforces.com/contest/1779/problem/C

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