typodupeerror

## Comment From his Facebook post on his Sudoku solver (Score 5, Interesting)230

He posted this on his Facebook.

For techies: the program does a backtrack search, choosing the next cell to guess which minimises the fanout.

Here’s a question for those reading the source code: if x is an (binary) integer, what does (x & -x) compute?

Hope you have fun playing with this. Please tell me if you find any bugs! – LHL

===========

As several of you noted, (x & –x) returns the least significant ‘1’ bit of x, i.e. the highest power of two that divides x. This assumes two’s complement notation for negative numbers, as some of you also pointed out. e.g. if x=12 (binary 1100), then (x & -x) = 4 (binary 100). I didn’t invent this; it is an old programming trick.

Nice!

## Comment Re:A bird carying a grenade? (Score 1)325

Just want to highlight that RC models such as multirotors do not use lithium ion batteries. They use lithium polymer batteries (LiPo / Li-Po). The two have different chemistries and that makes LiPos suitable for "drones" instead of Li-On.

## Comment Human *FLESH* Search is correct! (Score 1)109

No, "flesh" is NOT a racist typo! That is the direct translation of the actual Chinese phrase "ren rou sou suo".

ren rou: human flesh
sou suo: search

The idea is simply to leverage on the wide viewership of Internet communities (i.e.g forums and BBSes) to search or identify the actual "human flesh" responsible for the atrocities depicted in viral videos.

## Comment the VIRUS... what?! (Score 0)150

The Virus is currently exploiting an unknown vulnerability to spread.

Are all the security geeks busy at Blackhat such that nobody realized this mistake?

## Comment It was quite good but I had to upgrade (Score 1)310

I was upgraded to TP-Link WR1043ND because I needed a wireless router that supports Gigabit Ethernet and has a USB port. The USB port lets me to extend the available storage space allowing the router to serves as a simple web server as well as a NAS.

## Comment Skyjack only works for WiFi drones! (Score 4, Informative)161

While pro-grade multicopters like those to be deployed by Amazon operate at 2.4GHz, they do not use WiFi as their radio system! Typically, these multicopters are fitted radio systems such as Futaba, JR, Spektrum or 9X, and therefore Skyjack will not be able to take them down.

## Comment Re:NSA's relationship to AV companies (Score 1)264

Given their scale of operation, I'm sure they are more than capable of evading AV detections. It's easier to research and develop ways to go under the radar than asking for help from AV companies.

## Comment Re:Must be bullshit (Score 1)116

They could launch their attacks from China, through Europe / Japan / Korea / South America / Africa / etc... and then to the US. Would blocking China IP addresses be useful?

## Comment Toy quads! (Score 1)83

If the Lego quad interests you, you might want to check out V929, V939, V949, or V959. These toy grade quadcopters are dirt cheap. You can get one online for less than 50 bucks and they fly really well.

## Comment Re:It's only a speed bump (Score 1)58

Funny thing. If you are on the phone with someone and say "VPN", the call sometimes drops immediate. Works better in Chinese than English.

Is this really true? Did you actually experience it? It sounds incredible.

## Comment If you want a rooted tablet... (Score 1)275

Get those that cheap "shanzai" tablets from China. They come with pretty good hardware and quite a few already have ICS firmware released. Best of all, you need not worry about not being able to root the tablet.

## Comment Limited Android Market (Score 1)278

Not only that the price is expensive after factoring in the shipping charges, this tablet is MIPS-based, so it will have a very limited Android Market. Take note!

The tablet to get is actually Ainol Novo 7 Advanced, not the Novo 7 Basic stated in the article. The 7A has a much better hardware. It is widely believed that the Novo7A will get ICS real soon as there are videos of it running ICS circulating in the chinese forums.

Top Ten Things Overheard At The ANSI C Draft Committee Meetings: (7) Well, it's an excellent idea, but it would make the compilers too hard to write.

Working...