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

C. Even Subarrays

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

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POJ 3046. Ant Counting

动态规划典型例题

http://poj.org/problem?id=3046

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Codeforces Round #837 (Div. 2)

B. Hossam and Friends

https://codeforces.com/contest/1771/problem/B

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Codeforces Round #837 (Div. 2)

C. Hossam and Trainees

https://codeforces.com/contest/1771/problem/B

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AtCoder Beginner Contest 281

E - Least Elements

https://atcoder.jp/contests/abc281/tasks/abc281_e

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最短 Hamilton 路径

状态压缩 + 动态规划 典型例题

https://www.acwing.com/problem/content/93/

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