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AtCoder Beginner Contest 337 G. Tree Inversion(dfs序+树状数组+树上差分 补写法)
dfs
inversion
tree
version
数组
解决‘Could not find a version that satisfies the requirement pytest‘
find
require
version
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)
sum
version