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

C. Even Subarrays

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

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原数组：$[3,1,4,1,5,9]$
前缀和：$[3,4,8,9,14,23]$
差分：$[3,-2,3,-3,4,4]$

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NOMURA Programming Contest 2022（AtCoder Beginner Contest 253）

F - Operations on a Matrix

https://atcoder.jp/contests/abc253/tasks/abc253_f

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Monoxer Programming Contest 2022（AtCoder Beginner Contest 249）

E - RLE

https://atcoder.jp/contests/abc249/tasks/abc249_e

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