level 556 unsolveable?

camel · Post by **camel** » Fri Oct 26, 2012 7:49 pm

hi everyone,

are the crossflip levels the same for everyone? it seems as if my level 556 is not solveable or as if something rather weird going on. i tried with and without keeping blocker tiles in the 2 matrices as zero rows. i tried with 2 of my own solvers and also via a well known public Z(2) library. all the previous 555 levels are no problem ... i can solve them within seconds each.

will look into it ... but as the library comes up with a solution i guess the matrix is solveable and the problem would be on my side.

camel

camel · Post by **camel** » Fri Oct 26, 2012 7:53 pm

first i thought it could have to do with the square of the sides going beyond 256^2 but as i leave out the blocker tiles in my last attempts the a-matrix does not reach 256^2 by 256^2 yet.

will investigate

camel · Post by **camel** » Fri Oct 26, 2012 8:08 pm

ah ok ... this really could be the problem ... matrix goes over 65536^2 from level 555 to 556 even without blockers ...

level=555 / board_width=256 / board_height=256
#of blockers=6
reading 65530 x 65530 matrix with at most 655300000 non-zero entries (density at most: 0.15260)
reading 65530 x 1 matrix with at most 65530 non-zero entries (density at most: 1.00000)
Starttime: 1351256590 Endtime: 1351256708

level=556 / board_width=257 / board_height=257
#of blockers=215
reading 65834 x 65834 matrix with at most 658340000 non-zero entries (density at most: 0.15190)
reading 65834 x 1 matrix with at most 65834 non-zero entries (density at most: 1.00000)
Starttime: 1351255976 Endtime: 1351256110

camel · Post by **camel** » Tue Oct 30, 2012 3:21 pm

turned out that the well known library really had a bug. so hacker.org even helped to make the world of math libraries a little better

))