Register • Search • FAQ • Memberlist • Usergroups • Log in Still works in 2020 :-)      hacker.org Forum Index » Crossflip View previous topic View next topic Still works in 2020 :-) Author Message wischi Joined: 08 Apr 2012 Posts: 9 Still works in 2020 :-) A few years ago I gave a shot and tried a few levels by hand and thought about how to solve it programatically, but quickly lost interesst. Last weekend I gave it another shot and a few moments ago just reached 643. I solved it with a very straight forward gauss elimination and didn't optimize it very well ^^ At about level 300 I rewrote small parts of the program (transitioned from bool[] to BitArray). After that my estimates showed that solving all 643 would only take about a day on my machine so I didn't bother optimizing it any further. Solving the last puzzle took my machine/algorithm about 12 min and reading through the comments for this puzzle I'm very impressed that some people (I'm looking at you @tails ^^) managed to solve the last one in about 20 seconds on a celeron CPU years ago. Mon Jun 08, 2020 7:23 pm Display posts from previous:  All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year  Oldest FirstNewest First     hacker.org Forum Index » Crossflip All times are GMT Page 1 of 1   Jump to:  Select a forum General Discussion----------------The Hacker's Server Puzzles and Games Competitions----------------ChallengesChallenges SolvedGeneral PuzzlesModulo PuzzleRunaway Robot PuzzleMortal CoilBricolageOneOfUsPusherboyTapewormCrossflip Bot Competitions----------------GeneralWormageddonBitBath You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2005 phpBB Group Design by Freestyle XL / Flowers Online.