Codeforces Round 838 D(gcd)E(Cayley's formula)F(DP,线段树)G(构造) gcd 线段树 DP 树 构造 Cayley's formula

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2022

12-15

Codeforces Round 838 D(gcd)E(Cayley's formula)F(DP,线段树)G(构造)

gcd 线段树 DP 树 构造 Cayley's formula