A sorted list A contains 1, plus some number of primes.  Then, for every p < q in the list, we consider the fraction p/q. What is the K-th smallest fraction considered?  Return your answer as an array of ints, where answer[0] = p and answer[1] = q. E…

A sorted list A contains 1, plus some number of primes.  Then, for every p < q in the list, we consider the fraction p/q. What is the K-th smallest fraction considered?  Return your answer as an array of ints, where answer[0] = pand answer[1] = q. Ex…

Let's say we are given an array: [,,,,,,] We want to get K = 3 smallest items from the array and using Max heap data structure. So this is how to think about it. 1. We take first K items put it into Max Heap: 5 /     \ 4          1 2. Then we move fo…

A sorted list A contains 1, plus some number of primes.  Then, for every p < q in the list, we consider the fraction p/q. What is the K-th smallest fraction considered?  Return your answer as an array of ints, where answer[0] = pand answer[1] = q. Ex…

Recently i was doing some study on algorithms. A classic problem is to find the K largest(smallest) numbers from an array. I mainly studyed two methods, one is directly methold. It is an extension of select sort, always select the largest number from…

转自 http://blog.csdn.net/zxzxy1988/article/details/8587244 给定两个已经排序好的数组(可能为空),找到两者所有元素中第k大的元素.另外一种更加具体的形式是,找到所有元素的中位数.本篇文章我们只讨论更加一般性的问题:如何找到两个数组中第k大的元素?不过,测试是用的两个数组的中位数的题目,Leetcode第4题 Median of Two Sorted Arrays方案1:假设两个数组总共有n个元素,那么显然我们有用O(n)时间和O(n)空间的…

这次主要是讲如何在线性时间下找n个元素的未排序序列中第k小的数.当然如果\(k=1 or k=n\),即找最大最小 数,线性时间内遍历即可完成,当拓展到一般,如中位数时,相关算法就值得研究了.这里还要说明的是,排序解 决是一种平凡算法,但其复杂度是\(\Theta(nlogn)\) 这次内容的主要知识点有:1.随机化版本的分治法求解&分析  2.基于1的优化pivot选择的算法&分析   1.随机化版本的分治法求解与分析 首先,要明确的是现在我们要解决的问题是求解n元素序列的第k小数 这种…

There is a connected undirected graph with weights on its edges. It is guaranteed that each edge appears in at most one simple cycle. Assuming that the weight of a weighted spanning tree is the sum of weights on its edges, define V(k) V(k) as the wei…

A sorted list A contains 1, plus some number of primes.  Then, for every p < q in the list, we consider the fraction p/q. What is the K-th smallest fraction considered?  Return your answer as an array of ints, where answer[0] = p and answer[1] = q. E…

题目来源:https://leetcode.com/problems/median-of-two-sorted-arrays/ There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). 解题思路: 题目是这样的:给…