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You're given strings J representing the types of stones that are jewels, and S representing the stones you have. Each character in Sis a type of stone 阅读全文
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leetcode-766-Toeplitz Matrix A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same element. Now given an M x N matrix, ret 阅读全文
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思路： 1.第一次扫描字符串，记录每个字符最后出现的索引。 2.第二次扫描，如果当前索引是该字符的最后出现的索引，则记录当前分割段的长度。 参考： https://discuss.leetcode.com/topic/117141/java-2-pass-o-n-time-o-1-space-ext 阅读全文
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Given two integers L and R, find the count of numbers in the range [L, R] (inclusive) having a prime number of set bits in their binary representation 阅读全文
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Given a non-negative integer N, find the largest number that is less than or equal to N with monotone increasing digits. (Recall that an integer has m 阅读全文
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Given two lists Aand B, and B is an anagram of A. B is an anagram of A means B is made by randomizing the order of the elements in A. We want to find 阅读全文
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思路： 二分查找。 参考： https://leetcode.com/problems/find-smallest-letter-greater-than-target/discuss/110027 阅读全文
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You have a lock in front of you with 4 circular wheels. Each wheel has 10 slots: '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'. The wheels can rota 阅读全文
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In a given integer array nums, there is always exactly one largest element. Find whether the largest element in the array is at least twice as much as 阅读全文
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菜鸟一只，也是在尝试并学习和摸索爬虫相关知识。 1.首先分析要爬取页面结构。可以看到一列搜索的结果，现在需要得到每一个链接，然后才能爬取对应页面。 关键代码思路如下： 现在已经得到一系列链接，下面分析需要爬取的链接页面的结构。 2.分析页面，页面所有感兴趣的内容均在 div标签里面，可以使用beau 阅读全文