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AtCoder Beginner Contest 337 G. Tree Inversion(dfs序+树状数组+树上差分 补写法)

dfsinversiontreeversion数组

解决‘Could not find a version that satisfies the requirement pytest‘

findrequireversion

比较两个版本号 version1 和 version2

version

Codeforces Round 767 (Div. 1) D2. Game on Sum (Hard Version)(博弈 期望 dp 贡献)

sumversion
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