Your boxed display seems to be missing the 3 in the bottom left corner of a.
Jay. On 2 December 2016 at 03:10, Christian Robert <christian.rob...@polymtl.ca> wrote: > Not a bug report, > > > Left arg of GenGRID is maximum number of seconds to run (arg is optional > and default to 30 secs) > Right arg of GenGRID is the target maximum number of non-zero digits in the > grid (stopped by timer on the left side) > > > // generate a random grid and try for the next 60 seconds to reduce it into > a 20 non empty cells. > > Display a←60 GenGRID 20 > > ╔═══╤═══╤═══╦═══╤═══╤═══╦═══╤═══╤═══╗ > ║ 4 │ │ 5 ║ │ │ 2 ║ │ 7 │ 1 ║ > ╟───┼───┼───╫───┼───┼───╫───┼───┼───╢ > ║ │ │ ║ │ │ ║ │ │ ║ > ╟───┼───┼───╫───┼───┼───╫───┼───┼───╢ > ║ │ │ 9 ║ │ 4 │ ║ │ │ 6 ║ > ╠═══╪═══╪═══╬═══╪═══╪═══╬═══╪═══╪═══╣ > ║ │ │ ║ 9 │ │ ║ 8 │ │ ║ > ╟───┼───┼───╫───┼───┼───╫───┼───┼───╢ > ║ │ 3 │ ║ │ │ 6 ║ │ 4 │ ║ > ╟───┼───┼───╫───┼───┼───╫───┼───┼───╢ > ║ │ │ ║ │ │ ║ 3 │ │ ║ > ╠═══╪═══╪═══╬═══╪═══╪═══╬═══╪═══╪═══╣ > ║ │ 1 │ ║ │ 6 │ ║ │ 8 │ ║ > ╟───┼───┼───╫───┼───┼───╫───┼───┼───╢ > ║ │ 7 │ ║ │ 2 │ 1 ║ │ │ ║ > ╟───┼───┼───╫───┼───┼───╫───┼───┼───╢ > ║ │ │ 8 ║ │ │ ║ │ │ ║ > ╚═══╧═══╧═══╩═══╧═══╧═══╩═══╧═══╧═══╝ > > Took 60.37293294 secs (failed at reducing to 20, final was 21) > > a > 4 0 5 0 0 2 0 7 1 > 0 0 0 0 0 0 0 0 0 > 0 0 9 0 4 0 0 0 6 > 0 0 0 9 0 0 8 0 0 > 0 3 0 0 0 6 0 4 0 > 0 0 0 0 0 0 3 0 0 > 0 1 0 0 6 0 0 8 0 > 0 7 0 0 2 1 0 0 0 > 3 0 8 0 0 0 0 0 0 > > One of the hardest Sudoku you can dream of (I think) but still solvable. > > I got Lucky, because very few initial grids can be reduced as much as that > ... > > Will post my Sudoku workspace later when I'm satisfied with his behavior and > speed. > > > Xtian. >
