AtCoder Beginner Contest 293

E - Geometric Progression

https://atcoder.jp/contests/abc293/tasks/abc293_e

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Codeforces Round #853 (Div. 2)

D. Serval and Shift-Shift-Shift

https://codeforces.com/contest/1789/problem/D

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AtCoder Regular Contest 155

C - Even Sum Triplet

https://atcoder.jp/contests/arc155/tasks/arc155_c

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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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AtCoder Regular Contest 153

C - ± Increasing Sequence

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

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