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Atcoder Beginner Contest 339(A ~ G 讲解)
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A - TLD: 暴力 B - Langton's Takahashi:模拟 C - Perfect Bus:贪心,前缀和 D - Synchronized Players:搜索,遍历 E - Smooth Subsequence:DP 优化,线段树 F - Product Equality:哈希(乱搞) G - Smaller Sum:主席树
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