算法 - 随笔分类 - whowhoha

奇异值分解--图像分解恢复

摘要：因项目上需要用到特征提取算法，突然想起早些时候看吴军的数学之美里有讲到SVD分解，当时就大致浏览了下，今天在这里用图像作为例子加深下印象，显示下svd特征提取、降维效果。奇异值分解（Singular Value Decomposition）定理：设A为m*n阶复矩阵，则存在m阶酉阵U和n阶酉阵V，阅读全文

posted @ 2016-10-19 11:35 whowhoha 阅读(3592) 评论(0) 推荐(0)

leetcode6 Reverse Words in a String 单词取反

摘要：Reverse Words in a String 单词取反 whowhoha@outlook.com Question: Given an input string s, reverse the string word by word. For example, given s = "the sk 阅读全文

posted @ 2016-08-06 09:03 whowhoha 阅读(182) 评论(0) 推荐(0)

leetcode5 Implement strstr() 实现strstr函数功能

摘要：Implement strstr() 实现strstr函数功能 whowhoha@outlook.com Question: Implement strstr(). Returns the index of the first occurrence of needle in haystack, or 阅读全文

posted @ 2016-08-06 09:02 whowhoha 阅读(145) 评论(0) 推荐(0)

leetcode4 Valid Palindrome回文数

摘要：Valid Palindrome回文数 whowhoha@outlook.com Question: Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignor 阅读全文

posted @ 2016-08-06 09:01 whowhoha 阅读(132) 评论(0) 推荐(0)

leetcode2 Two Sum II – Input array is sorted

摘要：Two Sum II – Input array is sorted whowhoha@outlook.com Question: Similar to Question [1. Two Sum], except that the input array is already sorted in a 阅读全文

posted @ 2016-08-06 09:00 whowhoha 阅读(229) 评论(0) 推荐(0)

leetcode3 Two Sum III – Data structure design

摘要：Question: Design and implement a TwoSum class. It should support the following operations: add and find. add(input) – Add the number input to an inter 阅读全文

posted @ 2016-08-06 09:00 whowhoha 阅读(112) 评论(0) 推荐(0)

leetcode 练习1 two sum

摘要：leetcode 练习1 two sum whowhoha@outlook.com 问题描述 Given an array of integers, return indices of the two numbers such that they add up to a specific targe 阅读全文

posted @ 2016-08-04 20:25 whowhoha 阅读(120) 评论(0) 推荐(0)

算法导论_ch2

摘要：Ch2算法基础 whowhoha@outlook.com 2.1　插入排序输入：n个数的一个序列〈a1,a2,…,an〉。输出：输入序列的一个排列〈a′1,a′2,…,a′n〉，满足a′1≤a′2≤…≤a′n。我们希望排序的数也称为关键词。插入排序，插入排序的工作方式像许多人排序一手扑克牌。开阅读全文

posted @ 2016-06-28 17:27 whowhoha 阅读(239) 评论(0) 推荐(0)

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