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Problem Description There are n houses in the village and some bidirectional roads connecting them. Every day peole always like to ask like this "How 阅读全文
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Nearest Common Ancestors Description A rooted tree is a well-known data structure in computer science and engineering. An example is shown below: In t 阅读全文
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H. Special Palindrome A sequence of positive and non-zero integers called palindromic if it can be read the same forward and backward, for example: 15 阅读全文