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  • \$\begingroup\$ @Arnauld, thanks for the comment. I mentioned this briefly at the end of the "test data" section, but I added it to the "challenge" section now too. Please suggest more clarifying edits if you see anything unclear. \$\endgroup\$ Commented Nov 27, 2019 at 1:32
  • \$\begingroup\$ If the robot goes over the same point 3 or more times, how do we count that for self-intersections? \$\endgroup\$ Commented Nov 27, 2019 at 1:36
  • \$\begingroup\$ @xnor, do you have an example? \$\endgroup\$ Commented Nov 27, 2019 at 1:36
  • \$\begingroup\$ @PeterKagey Nope, I haven't checked whether it's possible. \$\endgroup\$ Commented Nov 27, 2019 at 1:37
  • 2
    \$\begingroup\$ On the "retraces steps" problem, [1,2,3,4,5,6] does interesting things. \$\endgroup\$ Commented Nov 27, 2019 at 21:31