Unable to install Homebrew

Unable to install Homebrew with this? ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)" What’s happened -e:70: warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777 ==> This script will install: /usr/local/bin/brew /usr/local/Library/... /usr/…

Interview Practice Extra 06 - Vending Machine

Question This is an actual question I encountered in an Amazon phone interview in November 2013. You are going to design the money changing algorithm for a vending machine. That is, after any purchase, the machine makes change to users with a combination of coins. And the machine only have…

Interview Practice 01 - Convert Binary Tree into Doubly Linked List

Question Convert binary search tree into doubly linked list. It’s required not to create any new node, but only turning pointers. Solution The following shows the concept of this question. 8 / 6 0 -> 5 = 6 = 7 = 8 = 9 = 0 = 1 / / 5 7 9 1 First, since node…

Save Terminal from Process Completed in Mac OSX

What’s happening One day, when I opened up terminal as usual, it showed [Process completed] and just terminated. I could not type any thing, run any scripts and work on my project. Even worse, this made me unable to install programs into my computer because many installations need to…

InstaMusic Beta is Coming!

Hi there, its been a long time that InstaMusic haven’t been updated. Sorry for that because I had been so busy in working on a game project in my company. Anyway, I am quitting for the sake of pursuing a master degree. And finally I have time to implement…

Take a Screenshot on Samsung Galaxy S2 after the Upgrade to Ice Cream Sandwich

Thank you for checking out this tutorial. Reading the discussions in this post, seems like there is quite a number of people having troubles to take screenshots with Galaxy S2. To clear any confusions, I summarized some information and added as followings. Hope you could make it too. Fingers crossed.…

InstaMusic Version 1.0.1

Version 1.0.1 Changelog Fixed music pausing bug Fixed bug to open now playing with no song Fixed bug such that music should stop after playing the last song Fixed minor bug that now playing screen will be opened when notification is clicked Fixed bug that the app crashed…

Detecting browsers of iPhone, iPod, iPad, Android and BlackBerry with JavaScript and PHP

To begin with, we need to understand that in the HTTP protocol, browser send its identity called user agent to the server to request the wanted webpage. Every browser has its only unique user agent value, and therefore we can check that value to identify the user browser. So, first…

Change author info for old commits in Git

While using hit, it is really usual to have regrets on the commits done, especially the name used. In order to change those information in your repository, open terminal (or cmd in windows), go to the folder of your git repositoy, and run the following commands. Remember, replace “old_name”…