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- C. Manipulating History(贪心/哈希/思维/好题)
- D. The Enchanted Forest(贪心/逆向思维/数学)
- C. Infected Tree(思维/dfs/树形dp)
- E - Coloring(组合数学/图论/dfs/dp)
- A. The Third Three Number Problem(构造/思维)
- B. Almost Ternary Matrix(构造/思维)
- C. The Third Problem(组合数学/思维)
- D. Almost Triple Deletions(dp/逆向思维/好题)
- B. Permutation(构造/贪心/思维)
- C. Schedule Management(二分/贪心)