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题目： Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. 确定整数是否是回文。 当它向前读取向后时，整数是回文。 E 阅读全文
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题目： Given a non-empty string check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. You m 阅读全文
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题目： Given an array of integers, return indices of the two numbers such that they add up to a specific target. 给定一个整数数组，返回两个数字的索引，使它们相加到特定目标。 You may a 阅读全文
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题目： Given a binary tree, determine if it is height-balanced. 给定二叉树，确定它是否是高度平衡的。 For this problem, a height-balanced binary tree is defined as: 对于此问题，高 阅读全文