Rurning-Rock

Preparation for interview

2017-04-17T00:00:00+00:00

What is the different between int and float?

int: 4 bytes

float: 4 bytes

Object Orient Programming

What is a clase?
What is an object?
What is the different between a class and an object?
What is the different between abstraction and inheritance?
What is the different between encapsulation and abstraction?

Blinder Key ShortCut Nodes

2017-04-04T00:00:00+00:00

Shift + Mouse Middle Button: Pan view NumPad 5: toggle between Orthographic-true right view or Perspective - some angles off view from left/right/top/down

Select in view port: Right Click on an object A Key: select or de-select everything

Select Multiple Object: press shift

Fix Federa Mate on Virtual Box auto resize problem

2017-03-06T00:00:00+00:00

Try the follow code, see if that works for you.

First step takes little longer, it is a huge update. Beware of your battery if you using laptop.

1- sudo dnf update

2- reboot

3- sudo dnf install gcc kernel-devel-$(uname -r)

4- Insert Guest Additions CD and Run the installer

5- reboot

Virtualbox version: 5.0.32 r112930

Federa Mate version: Fedora-MATE_Compiz-Live-x86_64-25-1.3

Reference

Subsequence vs. Substring

2017-03-04T00:00:00+00:00

Just saw a comprehensive definition in an algorithm class

A subsequence of a sequence (for example, an array, linked list, or string), obtained by removing zero or more elements and keeping the rest in the same sequence order.

A subsequence is called a substring if its elements are contiguous in the original sequence.

玄学公司校园O1&O2 坐等拒信

2017-03-02T00:00:00+00:00

这周一刚刚去完Amzon校园O1&O2连做。今天才发现了一些东西，看来是我太笨。现在坐等据信.

现在两个字：挫折。已经收不少据信，不少亚麻。

暑假还是乖乖刷题.

Git restore missing files from your online branch

2017-02-24T00:00:00+00:00

Some file was deleted accidently while doing the CS 421 mp.

git checkout .

Reference: some stackoverflow post

Linux-function to change user privilage

2017-02-22T00:00:00+00:00

setuid();

CS 241 Review

2017-02-11T00:00:00+00:00

Deadlock

In order for deadlock to occur, Coffman Conditions must present.

Why need to know Coffman Condition? Deadlock occurs only if all of the following conditons are exist. It looks like these four conditions are difficult to happen at the same time, but it is very likely to be happen.

Mutal Exclusion : The resource can only be access to one process at a time.
Hold and Wait : A process is requesting a resource while holding a resource.
Circular Wait : Process A holding resource X and Process B holding resourcec Y. Meanwhile, Process A requests resouces Y and Process B requests resource X. The meaning is very straight forward, just like the name making circular loop.
No Preemption : A process can not force another process to release its resources.

Prevent Deadlock

The ways to prevent deadlock happen is simple, breaking one of the Coffman Conditions.

First Post

2017-01-11T00:00:00+00:00

A first post on Jekyll.

Found Jekyll is an awesome static web generator.

Will start learning how to use liquid templete -> Djongo.

A Post Jekyll Automatic =)

2017-01-10T00:00:00+00:00

You’ll find this post in your _posts directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run jekyll serve, which launches a web server and auto-regenerates your site when a file is updated.

To add new posts, simply add a file in the _posts directory that follows the convention YYYY-MM-DD-name-of-post.ext and includes the necessary front matter. Take a look at the source for this post to get an idea about how it works.

Jekyll also offers powerful support for code snippets:

def print_hi(name)
  puts "Hi, #{name}"
end
print_hi('Tom')
#=> prints 'Hi, Tom' to STDOUT.

Check out the Jekyll docs for more info on how to get the most out of Jekyll. File all bugs/feature requests at Jekyll’s GitHub repo. If you have questions, you can ask them on Jekyll Talk.