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【LeetCode从零单排】No.135Candy(双向动态规划)
1.题目There are N children standing in a line. Each child is assigned a rating value.You are giving candies to these children subjected to the following requirements:Each child must have at least one ca...
分类:其他好文   时间:2015-07-29 15:57:18    阅读次数:149
【LeetCode-面试算法经典-Java实现】【053-Maximum Subarray(最大子数组和)】
【053-Maximum Subarray(最大子数组和)】【LeetCode-面试算法经典-Java实现】【所有题目目录索引】原题  Find the contiguous subarray within an array (containing at least one number) which has the largest sum.   For example, given the ar...
分类:编程语言   时间:2015-07-29 07:55:12    阅读次数:131
LeetCode-LRU Cache
链接:http://oj.leetcode.com/problems/lru-cache/ 参考:http://www.acmerblog.com/leetcode-lru-cache-lru-5745.html Design and implement a data structure for Least Recently Used (LRU) cache. It shoul...
分类:系统相关   时间:2015-07-28 18:36:30    阅读次数:174
[leedcode 146] LRU Cache
Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations:getandset.get(key)- Get the valu...
分类:系统相关   时间:2015-07-28 06:39:22    阅读次数:168
Alternating Least Squares(ASL) 的数学推导
最近在看CF的相关论文,《Collaborative Filtering for Implicit Feedback Datasets》思想很好,很容易理解,但是从目标函数 是如何推导出Xu和Yi的更新公式的推导过程却没有很好的描述,所以下面写一下 推导: 首先对Xu求导: 其中Y是item矩阵,n*f维,每一行是一个item_vec,C^u是n*n维的对角矩阵, 对角线上...
分类:其他好文   时间:2015-07-27 21:12:10    阅读次数:410
hdoj 1019 最小公倍数问题
我最初以为这是大树乘除法问题,后来发现只是普通的求最小公倍数方法。 原题: Least Common Multiple Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 38411    Accepted Submissio...
分类:其他好文   时间:2015-07-27 19:04:12    阅读次数:108
LeetCode ---LRU Cache
Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set. get(key) - Get the value (will always be positive) of the key if the...
分类:系统相关   时间:2015-07-24 18:31:55    阅读次数:126
LRU Cache
Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations:getandset.get(key)- Get the valu...
分类:系统相关   时间:2015-07-24 17:57:34    阅读次数:180
LRU Cache的简单实现
Cache这个东西可以说无处不在,处理器中的TLB,Linux系统中的高速页缓存,还有很多人熟知的开源软件memcached,都是cache的一种实现。LRU是Least Recently Used的缩写,即最近最少使用,是常用cache算法中的一种。因为cache的存储空间相对于后端存储来说更有限,将cache空间和后端存储空间映射后,还需要一些算法来解决cache满的问题并保证效率,LRU就是...
分类:系统相关   时间:2015-07-23 23:53:10    阅读次数:226
Project Euler:Problem 88 Product-sum numbers
A natural number, N, that can be written as the sum and product of a given set of at least two natural numbers, {a1, a2, ... , ak} is called a product-sum number: N = a1 + a2 + ... + ak = a1 × a2 × ...
分类:其他好文   时间:2015-07-23 23:48:41    阅读次数:140
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