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 5 5 10
AcWing908   最大不相交区间数量 6 5 10
AcWing906   区间分组 4 4 10
AcWing907   区间覆盖 5 3 10

Section 2. Huffman树

Open

Problem Tried AC Difficulty
AcWing148   合并果子 7 6 9
 
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