Codeforces Round #853 (Div. 2)

D. Serval and Shift-Shift-Shift

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