包括区间问题，Huffman树，排序不等式，绝对值不等式，推公式等内容。

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Section 1. 区间问题

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Problem Tried AC Difficulty
AcWing905  区间选点 4 4 10
AcWing908  最大不相交区间数量 5 4 10
AcWing906  区间分组 3 3 10
AcWing907  区间覆盖 4 2 10

Section 2. Huffman树

Open

Problem Tried AC Difficulty
AcWing148  合并果子 3 3 10
 
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