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- 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)
- D. Permutation Restoration(贪心/双指针/set)
- B. Mark the Dust Sweeper(思维)
- A. Difference Operations(思维)