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7-3 Color the Tree (35分) There is a kind of balanced binary search tree named red-black tree in the data structure. It has the following 5 properties: 阅读全文
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7-2 Number Game (35分) A number game is to start from a given number A, and to reach the destination number B by a sequence of operations. For the curr 阅读全文
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7-1 Professional Ability Test (30分) Professional Ability Test (PAT) consists of several series of subject tests. Each test is divided into several lev 阅读全文