Place the numbers 19 in the boxes so that the difference of each pair of numbers joined by a line is at least three. The number 8 has already been placed.
(In reply to
re: Computer solution: not just for 8 by ed bottemiller)
Of course it was my
FOR n = 1 TO 8
in the main routine, instead of
FOR n = 1 TO 9
that caused the failure of my program to find the solution with 9 at the upper left.

Posted by Charlie
on 20100804 15:36:45 