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How can worst case time complexity of Hashtable be O(n^2)
Hash tablesareO(1)average andamortizedcase complexity, however is suffers fromO(n)worst casetime complexity. [And I think this is where your confusion...
分类:其他好文   时间:2015-08-28 13:12:51    阅读次数:170
【Leetcode】【Hard】Merge k Sorted Lists
Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity.解题思路:1、先取出k个list的首元素,每个首元素是对应list中的最小元素,组成一个具有k个结点的最小堆...
分类:其他好文   时间:2015-08-28 12:46:35    阅读次数:208
python数据结构与算法——哈希表
哈希表 学习笔记参考翻译自:《复杂性思考》及对应的online版本:http://greenteapress.com/complexity/html/thinkcomplexity004.html使用哈希表可以进行非常快速的查找操作,查找时间为常数,同时不需要元素排列有序python的内建数据类型:...
分类:编程语言   时间:2015-08-28 07:08:46    阅读次数:467
stochastic noise and deterministic noise
在机器学习中,导致overfitting的原因之一是noise,这个noise可以分为两种,即stochastic noise,随机噪声来自数据产生过程,比如测量误差等,和deterministic noise,确定性噪声来自added complexity,即model too complex。这两种类型的造成来源不同,但是对于学习的影响是相似的...
分类:其他好文   时间:2015-08-27 16:51:58    阅读次数:120
*Sort List
题目:Sort a linked list inO(nlogn) time using constant space complexity.思路:考虑到要求用O(nlogn)的时间复杂度和constant space complexity来sort list,自然而然想到了merge sort方法。...
分类:其他好文   时间:2015-08-27 14:48:29    阅读次数:108
(leetcode)Search for a Range
Given a sorted array of integers, find the starting and ending position of a given target value.Your algorithm's runtime complexity must be in the ord...
分类:其他好文   时间:2015-08-25 19:26:03    阅读次数:183
Merge k Sorted Lists leetcode
Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity.Hide TagsDivide and ConquerLinked ListHeapHide Similar...
分类:其他好文   时间:2015-08-20 01:17:03    阅读次数:192
求两个有序数组的中位数
1 题目 There are two sorted arrays nums1 and nums2 of size m and n respectively. Find themedian of the two sorted arrays. The overall run time complexity should beO(log (m+n)). 2 分析 若m+n为奇数则中位数(med...
分类:编程语言   时间:2015-08-19 20:29:16    阅读次数:169
leetcode——Median of Two Sorted Array
原题为: 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)). 好吧,我是普...
分类:其他好文   时间:2015-08-19 17:54:35    阅读次数:119
leetcode:Merge k Sorted Lists
Merge k Sorted Lists Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.分析 The basic idea is really simple. We can merge first two lists and then push i...
分类:其他好文   时间:2015-08-19 13:32:20    阅读次数:98
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