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Given a non-empty array of integers, return the k most frequent elements. Example 1: Example 2: Input: nums = [1], k = 1 Output: [1] Example 2: Note: 阅读全文
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布隆过滤器 布隆过滤器主要用于判断一个元素是否在一个集合中，它可以使用一个位数组简洁的表示一个数组。它的空间效率和查询时间远远超过一般的算法，但是它存在一定的误判的概率，适用于容忍误判的场景。如果布隆过滤器判断元素存在于一个集合中，那么大概率是存在在集合中，如果它判断元素不存在一个集合中，那么一定不 阅读全文
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inBound事件 当发生某个IO事件的时候，例如链路建立，链路关闭，读取操作完成（register,read,active）等，都会产生一个事件，事件在pipeline中传播和处理。pipeline中以fireXXX命名的方法都是从IO线程向用户业务Handler的inBound事件，它们的实现因 阅读全文
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Given a positive integer n, break it into the sum of at least two positive integers and maximize the product of those integers. Return the maximum pro 阅读全文
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Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation and r 阅读全文
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Given a list of airline tickets represented by pairs of departure and arrival airports [from, to], reconstruct the itinerary in order. All of the tick 阅读全文
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The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the "root." Besides the root, each hou 阅读全文
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Given an unsorted array return whether an increasing subsequence of length 3 exists or not in the array. Formally the function should: Note: Your algo 阅读全文
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Given an unsorted array nums, reorder it such that nums[0] < nums[1] > nums[2] < nums[3].... Example 1: Example 2: Note: You may assume all input has 阅读全文
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One way to serialize a binary tree is to use pre-order traversal. When we encounter a non-null node, we record the node's value. If it is a null node, 阅读全文