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Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be determined by a given pair of postorder and ino 阅读全文
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PAT 1018 Public Bike Management(30分) There is a public bike service in Hangzhou City which provides great convenience to the tourists from all over th 阅读全文
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1013 Battle Over Cities(25分) It is vitally important to have all the cities connected by highways in a war. If a city is occupied by the enemy, all th 阅读全文
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1030 Travel Plan(30分) A traveler's map gives the distances between cities along the highways, together with the cost of each highway. Now you are supp 阅读全文