Codeforces Hello 2025

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Problems AC Note
A. MEX Table ○
B. Gorilla and the Exam ○
C. Trip to the Olympiad ○
D. Gifts Order ○ 线段树
E1. Another Exercise on Graphs (Easy Version) ⊕ 二分
E2. Another Exercise on Graphs (hard version) ⊕ 并查集
F. Formation
G. Secret Message
H. Coffee Break
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