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Geeks : Dijkstra’s Algorithm for Adjacency List Representation 最短路径
最短路径的O(ElgV)的解法。 使用邻接表存储图,使用堆操作选取下一个最小路径点。 本题的难度并不在最短路径本身这个算法,而是在于堆的操作: 1 使用双重指针操作堆的节点,可以省去直接复制操作堆节点,提高效率,并且这才是有效操作动态地址数据的方法,不用双重指针,我思考了下,觉得更加不好做。 2 使用一个数组记录当前顶点在堆中的位置,相当于一个hash表了,可以需要的时候,直接从表中查找表...
分类:其他好文   时间:2014-06-07 02:03:17    阅读次数:214
First Missing Positive
Given an unsorted integer array, find the first missing positive integer.For example,Given[1,2,0]return3,and[3,4,-1,1]return2.Your algorithm should ru...
分类:其他好文   时间:2014-06-04 20:13:41    阅读次数:350
背景减法——Vibe
VIBE是Barnich和Droogenbroeck在2011年发表的《VIBE:A universalbackground subtraction algorithm for video sequence》中提出。其在模型中大量的使用了随机策略,有着意想不到的准确率和鲁棒性,该方法简单实用,计算代...
分类:其他好文   时间:2014-05-31 01:25:54    阅读次数:1657
Best Time to Buy and Sell Stock III
Say you have an array for which theithelement is the price of a given stock on dayi.Design an algorithm to find the maximum profit. You may complete a...
分类:其他好文   时间:2014-05-30 16:19:05    阅读次数:320
Single Number
Given an array of integers, every element appearstwiceexcept for one. Find that single one.Note:Your algorithm should have a linear runtime complexity...
分类:其他好文   时间:2014-05-30 16:16:29    阅读次数:190
Single Number II
Given an array of integers, every element appearsthreetimes except for one. Find that single one.Note:Your algorithm should have a linear runtime comp...
分类:其他好文   时间:2014-05-30 15:15:53    阅读次数:225
Best Time to Buy and Sell Stock II
Say you have an array for which theithelement is the price of a given stock on dayi.Design an algorithm to find the maximum profit. You may complete a...
分类:其他好文   时间:2014-05-30 15:00:54    阅读次数:335
Coursera algorithm II PA4
题意:所给数据中是否有负环? 没有负环的图中所有路径中最短的值思路:1. bellmanford 判断负环2.flodyWarshall 求所有定点的最短路径细节:1. bellmanford 算法时间复杂度为 o(n^3), 因为图的使用邻接矩阵存储的, 使用邻接表代码会容易理解些, 引用 wik...
分类:其他好文   时间:2014-05-29 20:41:30    阅读次数:237
Coursera Algorithm Part II PA2
题意:computing a max-spacingk-clustering.spacing 是指两个 cluster 之间的最小距离输入:[number_of_nodes][edge 1 node 1] [edge 1 node 2] [edge 1 cost][edge 2 node 1] [e...
分类:其他好文   时间:2014-05-29 20:40:30    阅读次数:323
Coursera Algorithm II PA2 Q2
题意:what is the largest value ofksuch that there is ak-clustering with spacing at least 3? That is, how many clusters are needed to ensure that no pair...
分类:其他好文   时间:2014-05-29 20:39:26    阅读次数:305
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