7 ms·

Project Euler is partly back

50 points by akg 12y ago

balloot 12y ago
Sad. Project Euler is pretty much useless without the problem checking feature. Anyone know a good alternative?
- zxide 12y ago
  A few months ago I made a gem to manage, run, and test project euler problems. https://github.com/yaworsw/euler-manager https://github.com/yaworsw/euler-manager
  - reledi 12y ago
    It looks like you check against static answers [1]. This won't work in the long run because, as far as I'm aware, PE changes the numbers in their problems to prevent cheating. Which means the answers you have would be outdated. 1: https://github.com/yaworsw/euler-manager/blob/master/data/answers.yml https://github.com/yaworsw/euler-manager/blob/master/data/an...
- perturbation 12y ago
  Did this pretty quickly: http://project-euler-solution.herokuapp.com/ http://project-euler-solution.herokuapp.com/ Give it a shot? Don't have answers to all questions.
abhididdigi 12y ago
This is sad. Because of this they have sealed off the ability to check answers. Anyone know of a way to get all the Project Euler problems offline and their solutions?
- captn3m0 12y ago
  You can check out codebot[0] for checking your solutions. The source and problems are all on GitHub: https://github.com/sdslabs/codebot https://github.com/sdslabs/codebot [0]: http://codebot.sdslabs.co/ http://codebot.sdslabs.co/
yeukhon 12y ago
How did they find out they were hacked in the first place? This is always interesting to me as I don't think Project Euler would have some sophisticated security logging audit system in place.
jejones3141 12y ago
The forum has returned, but OTOH when I try to log in it says it has no record of my username.
Igglyboo 12y ago
Well it's not back completely, now it's just a static site with the problem set restored. No ability to check answers or log in and track your progress.
dang 12y ago
We changed the title to say "partly".
captn3m0 12y ago
I did a dump of Project Euler sometime back. The script, code, and problems, and solutions are all on github [0]. The finished product was just a terminal-style UI to Project Euler called codebot. You can try it out at http://codebot.sdslabs.co/ http://codebot.sdslabs.co/ [0]: http://github.com/sdslabs/codebot http://github.com/sdslabs/codebot
- abhididdigi 12y ago
  Thanks!
djf1 12y ago
The part about salting confuses me. Shouldn't salting remain effective against rainbow tables even when the salting mechanism is known?
- dnet 12y ago
  It should, and they just said "the integrity of weak passwords cannot be guaranteed" -- even the best salting cannot prevent attackers performing brute force attacks; it will be slow, but weak passwords may be cracked in reasonable time.
- wolf550e 12y ago
  crypto101 says that because of how fast GPUs are at computing hashes, even using long per-user salt is now broken and you must use pbkdf2 or better yet, scrypt.
akg 12y ago
Looks like they have enabled answer checking again .

50 points by akg 12y ago

balloot 12y ago

Sad. Project Euler is pretty much useless without the problem checking feature. Anyone know a good alternative?

zxide 12y ago
A few months ago I made a gem to manage, run, and test project euler problems. https://github.com/yaworsw/euler-manager https://github.com/yaworsw/euler-manager
- reledi 12y ago
  It looks like you check against static answers [1]. This won't work in the long run because, as far as I'm aware, PE changes the numbers in their problems to prevent cheating. Which means the answers you have would be outdated. 1: https://github.com/yaworsw/euler-manager/blob/master/data/answers.yml https://github.com/yaworsw/euler-manager/blob/master/data/an...
perturbation 12y ago
Did this pretty quickly: http://project-euler-solution.herokuapp.com/ http://project-euler-solution.herokuapp.com/ Give it a shot? Don't have answers to all questions.

abhididdigi 12y ago

This is sad. Because of this they have sealed off the ability to check answers. Anyone know of a way to get all the Project Euler problems offline and their solutions?

captn3m0 12y ago
You can check out codebot[0] for checking your solutions. The source and problems are all on GitHub: https://github.com/sdslabs/codebot https://github.com/sdslabs/codebot [0]: http://codebot.sdslabs.co/ http://codebot.sdslabs.co/

yeukhon 12y ago

How did they find out they were hacked in the first place? This is always interesting to me as I don't think Project Euler would have some sophisticated security logging audit system in place.

jejones3141 12y ago

The forum has returned, but OTOH when I try to log in it says it has no record of my username.

Igglyboo 12y ago

Well it's not back completely, now it's just a static site with the problem set restored. No ability to check answers or log in and track your progress.

dang 12y ago

We changed the title to say "partly".

captn3m0 12y ago

I did a dump of Project Euler sometime back. The script, code, and problems, and solutions are all on github [0]. The finished product was just a terminal-style UI to Project Euler called codebot. You can try it out at http://codebot.sdslabs.co/ http://codebot.sdslabs.co/ [0]: http://github.com/sdslabs/codebot http://github.com/sdslabs/codebot

abhididdigi 12y ago
Thanks!

djf1 12y ago

The part about salting confuses me. Shouldn't salting remain effective against rainbow tables even when the salting mechanism is known?

dnet 12y ago
It should, and they just said "the integrity of weak passwords cannot be guaranteed" -- even the best salting cannot prevent attackers performing brute force attacks; it will be slow, but weak passwords may be cracked in reasonable time.
wolf550e 12y ago
crypto101 says that because of how fast GPUs are at computing hashes, even using long per-user salt is now broken and you must use pbkdf2 or better yet, scrypt.

akg 12y ago

Looks like they have enabled answer checking again .