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题目： Given an array, rotate the array to the right by k steps, where k is non-negative. 给定一个数组，将数组向右旋转k步，其中k为非负数。 Example 1: Example 2: Note: Try to co 阅读全文
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题目： You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quali 阅读全文
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题目： Count the number of prime numbers less than a non-negative number, n. 计算小于非负数n的素数的数量。 Example: 解答： 方法一：超时 方法二： 详解： 判断素数：埃拉托斯特尼筛法 遍历2到根号n，将质数2的全部倍数 阅读全文
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题目： Given a positive integer, return its corresponding column title as appear in an Excel sheet. 给定正整数，返回Excel工作表中显示的相应列标题。 For example: Example 1: Ex 阅读全文
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题目： Given a non-empty array of integers, return the third maximum number in this array. If it does not exist, return the maximum number. The time comp 阅读全文
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题目： A robot on an infinite grid starts at point (0, 0) and faces north. The robot can receive one of three possible types of commands: 无限网格上的机器人从点（0,0 阅读全文
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题目： Given an array of integers and an integer k, you need to find the number of unique k-diff pairs in the array. Here a k-diff pair is defined as an 阅读全文
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题目： Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. 给定一个字符串，确定它是否是回文，只考虑字母数字字符并忽略大小写。 No 阅读全文
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题目： Reverse bits of a given 32 bits unsigned integer. 给定32位无符号整数的反转位。 Example: Input: 43261596 Output: 964176192 Explanation: 43261596 represented in 阅读全文
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题目： Given an integer array, you need to find one continuous subarray that if you only sort this subarray in ascending order, then the whole array will 阅读全文