leonordo-优快云博客

原创 Symmetric Tree

Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).For example, this binary tree is symmetric: 1 / \ 2 2 / \ / \3 4 4 3But the f

2015-09-20 16:53:06 743

原创 Remove Element

Given an array and a value, remove all instances of that value in place and return the new length.The order of elements can be changed. It doesn't matter what you leave beyond the new length.s

2015-09-18 13:55:30 567

原创 Remove Duplicates from Sorted Array

Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.Do not allocate extra space for another array, you must do this in place with

2015-09-18 11:46:32 556

原创 Palindrome Linked List

Given a singly linked list, determine if it is a palindrome.Follow up:Could you do it in O(n) time and O(1) space?solution: two pointers, one pointer step 1, the other pointer step 2, find t

2015-09-08 18:39:40 478

原创 Valid Anagram

Given two strings s and t, write a function to determine if t is an anagram of s.For example,s = "anagram", t = "nagaram", return true.s = "rat", t = "car", return false.Note:You may a

2015-09-08 15:16:58 537

原创 Binary Search Tree Iterator

Binary Search Tree Iterator

2015-09-06 15:57:47 426

原创 Swap Nodes in Pairs

Given a linked list, swap every two adjacent nodes and return its head.For example,Given 1->2->3->4, you should return the list as 2->1->4->3.Your algorithm should use only constant space. Y

2015-09-06 12:15:29 437

原创 Merge k Sorted Lists

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.solution: 这道题是merge 2 sorted linked lists的扩展，从2-》K的问题，很多可以化为分治法（divide and conquer）求解。假设每个list都是n长

2015-09-06 11:01:26 408

原创 Generate Parentheses

Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, given n = 3, a solution set is:"((()))", "(()())", "(())()", "()(())", "()()

2015-09-01 22:47:30 424

原创 Merge Two Sorted Lists

Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.solution: use recursive method.#include /** * Defin

2015-08-31 17:39:55 484

原创 Valid Parentheses

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.The brackets must close in the correct order, "()" and "()[]{}" are all va

2015-08-31 15:15:03 386

原创 Remove Nth Node From End of List

Given a linked list, remove the nth node from the end of list and return its head.For example, Given linked list: 1->2->3->4->5, and n = 2. After removing the second node from the end, the

2015-08-31 13:09:35 390

原创 4Sum

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target.Note:Element

2015-08-31 11:38:58 418

原创 Letter Combinations of a Phone Number

Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephone buttons) is given below.Input:Digi

2015-08-28 11:14:44 577

原创 3Sum Closest

Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exact

2015-08-28 10:28:54 407

原创 3Sums

Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.Note:Elements in a triplet (a,b,c

2015-08-27 17:14:36 588

原创 Longest Common Prefix

Write a function to find the longest common prefix string amongst an array of strings.class Solution {public: string longestCommonPrefix(vector& strs) { if(strs.size() == 0)

2015-08-27 11:48:58 394

原创 Roman to Integer

Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.#include class Solution {public: int charToInt(const char roman){ s

2015-08-26 17:55:56 408

原创 Integer to Roman

Given an integer, convert it to a roman numeral.Input is guaranteed to be within the range from 1 to 3999.查表法：class Solution {public: string intToRoman(int num) { string roman

2015-08-26 15:40:58 566

原创 Container With Most Water

Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (i, 0). Fin

2015-08-26 14:29:19 363

原创 Palindrome Number

Determine whether an integer is a palindrome. Do this without extra space.class Solution {public: bool isPalindrome(int x) { int inverseX = 0; int value = 0; if(x < 0){

2015-08-24 18:25:21 412

原创 String to Integer (atoi)

Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input ca

2015-08-24 17:53:56 446

原创 Reverse Integer

Reverse digits of an integer.Example1: x = 123, return 321Example2: x = -123, return -321click to show spoilers.Have you thought about this?Here are some good questions to ask before c

2015-08-24 16:05:43 423

原创 ZigZag Conversion

The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)P A H NA P L S I

2015-08-24 14:09:30 551

原创 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)).Solution: 求两个有序数组的中位数，采用分

2015-07-28 22:21:46 747

原创 Longest Palindromic Substring

Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring.Solution: 用二维矩阵p存储

2015-07-28 22:17:37 386

You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a link

2015-07-08 22:07:16 530

原创 Two Sum

Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices of the two numbers such that they add up to the target, whe

2015-07-07 23:04:32 601

原创 deep learning for face detection

深度学习如何做人脸检测

2015-06-03 16:10:54 11949 23

原创 caffe tools command

1. compute the mean image.#!/usr/bin/env sh# Compute the mean image from the imagenet training leveldb# N.B. this is available in data/ilsvrc12./build/tools/compute_image_mean /mnt_data/yilin_gu

2015-05-13 15:53:43 1897

原创 leetcode: Happy Number

Write an algorithm to determine if a number is "happy".A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares

2015-05-11 15:07:45 648

原创 leetcode 之 Reverse Linked List

Reverse a singly linked list./** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */class So

2015-05-11 11:21:30 2286

原创 Beyond Frontal Faces: Improving Person Recognition Using Multiple Cues

最近阅读到Facebook AI实验室发的一篇文章，Beyond Frontal Faces: Improving Person Recognition Using Multiple Cues，主要用来做person recognition。论文提到，传统的deepface适用于正脸（frontal face）的情形，但是对于侧脸、脸部有遮挡、背脸的情形下，效果不理想，论文作者提到利用身体的各个

2015-03-30 21:31:46 1805 1

原创 cuDNN: efficient Primitives for Deep Learning 论文阅读笔记

这篇论文主要讨论如何针对CNN做一些GPU矩阵计算的优化。传统CNN计算主要开销是在convolutions, activation function, pooling.首先，我们看convolution的操作过程:参数表：O是输出input feature map，F是filter, D0是input feature map. 从公式看到如果用循环操作，需要7次循

2015-03-12 16:41:09 4504

原创 Caffe SGD shuffle mechanism

As we know, the SGD need to shuffle all data in an epoch(the number of data), and read data sequentially batch by batch. How Caffe implement the shuffle mechanism?The input data format of caffe

2015-02-28 14:08:04 5366

原创 caffe python 批量抽取图像特征---续篇

caffe python 批量抽取图像特征---续篇

2015-02-02 23:08:23 7114

转载 practice experience of deep learning from Ilya Sutskever

Practical Advice.Ok. So you’re sold. You’re convinced that LDNNs are the present and the future and you want to train it. But rumor has it that it’s so hard, so difficult… or is it? The reality is

2015-01-26 13:53:50 1201

原创 caffe c++ 抽取图片特征

caffe c++批量抽取特征的方法在[1]，但是该方法使用中有几个疑问：1. 如何转换levelDB 格式为libsvm格式。2. ./build/tools/extract_features mini-batch 是代表什么意思，和imagenet_val.prototxt中的batch_size的关系是什么？

2015-01-19 22:47:00 22278 6

原创 caffe python批量抽取图像特征

原始的caffe教程提供单张图片的抽取，这里我们谈下如何用python批量抽取特征。

2015-01-19 22:36:37 28155 13

原创 caffe python visualization程序解析

本文主要对http://nbviewer.ipython.org/github/BVLC/caffe/blob/master/examples/filter_visualization.ipynb进行代码解析。1. net.blobs.items() 存储了预测图片的网络中各层的feature map的数据。2. net.params.items()存储了训练结束后学习好的网络参数。3

2015-01-19 15:35:42 9474 6

Learning Spark

spark 作者自己最新写的书。这是作者目前自己放出来的。

2015-01-07

Undocument Windows NT中文版.chm

2010-12-21

驱动程序超级宝典--翟洪涛译

经典，不用多说，是被译为中文的MSDN DDK文档。

2009-11-05

Software Architecture4+1

本文基于多个并发视图的使用情况来说明描述软件密集型系统架构的模型。使用多重视图允许独立地处理各"风险承担人"：最终用户、开发人员、系统工程师、项目经理等所关注的问题，并且能够独立地处理功能性和非功能性需求。本文分别对五种视图进行了描述，并同时给出了捕获每种视图的表示方法。这些视图使用以架构为中心的、场景驱动以及迭代开发过程来进行设计。

2009-03-15

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