摘要：
1.题目The "Hamilton cycle problem" is to find a simple cycle that contains every vertex in a graph. Such a c... 阅读全文
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1.题目"Damn Single (单身狗)" is the Chinese nickname for someone who is being single. You are supposed to find ... 阅读全文
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1.题目Two integers are called "friend numbers" if they share the same sum of their digits, and the sum is th... 阅读全文
摘要：
1.题目Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be... 阅读全文