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Easy A binary tree is univalued if every node in the tree has the same value. Return true if and only if the given tree is univalued. Example 1: Examp 阅读全文
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Easy A website domain like "discuss.leetcode.com" consists of various subdomains. At the top level, we have "com", at the next level, we have "leetcod 阅读全文
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Easy The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum of the two precedin 阅读全文
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Easy Given an array of distinct integers arr, find all pairs of elements with the minimum absolute difference of any two elements. Return a list of pa 阅读全文