hacker.org

In this Thread, there is one Solution using Java and one using Bash - just use one of these.

So, is the problem after all going to be included? Imo there are some challenges that are way harder to solve and have less hints on how to do so.


@amfv: It's kind of the right way, but in some kind not.

I was able to reconstruct all the viewpoints - but I can't actually see what to do with these information :s

@AMindForeverVoyaging: I think that's a bit too much of a clue - I didn't know what to do with this challenge, but when I read your post it was pretty obvious :s

The encoding actually isn't very hard, actually you may know it from some other challenges.



Without spoiling too much: Maybe it isn't such a bad idea to use ASCII in the beginning ;)

I'd rather say he uses the properties the matrix has [symmetric, sparse and Elements in Gf(2)].

This challenge was quite easy, eventhough th "nothing" irritated me at first. I thought you would have to form the word "nothing" from letters in the grid, concatenate the numbers to the left and right of each letter and use these as Ascii-Codes. But each of these letters appeare...

AMindForeverVoyaging wrote:165? Huh? I found the solution after 5 minutes of trying - the previous one, 'Typo', actually took me longer ;)

Same here - I found the solution to this one pretty fast, whereas "Typo" took a whole lot of time.

Actually, all these colors don't matter. You better take a look at the PNG specifications and check the file itself.

I analyzed the Code until I found out, what it is doing - reversing it in C++ wasn't hard after that.


Eventhough afair, it is possible for two distinct messages to be ciphered into the same message - luckily this was no problem in this case.

Changing to another color palette might reveal the answer.

I tried your command and it worked for me . Maybe it works with my script: #!/bin/bash for lvl in {1..643} do echo -n "Receiving sourcecode for lvl "${lvl}"... " code=`lynx -source "http://www.hacker.org/cross/index.php?gotolevel="${lvl}"&go=Go+To+Level&nam...

Yeah, by n i meant length * height. Solving #224 takes 4.78s on my computer [not counting the time to get the level and sending the solution]. In every instruction I manipulate 64 bits at the same time by using unsigned long long as type for saving the data [which improves my code a lot since I use ...

I've tried to inject code, but it doesn't work.

What code did you try to inject? This challenge isn't really complicated, you don't need any kind of software but your browser.

18 seconds? Holy shit oO I used Gauss on an average Computer [dualcore 2,2GHz, 64 Bit Ubuntu 10.10] and may be able to double the speed if I use threads [gonna try out that one next]. I guess you used a way better algorithm? Edit: Ok, threading seems to slow down my program :[ Looks like I can't opt...