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\$\begingroup\$ Welcome to Programming Puzzles & Code Golf! Amazing first answer! \$\endgroup\$

Denker
– Denker

2016-03-14 21:00:57 +00:00
Commented Mar 14, 2016 at 21:00
\$\begingroup\$ This fails to find the longest path even on the smallest 3×3 example case: it finds a path through 6 nodes instead of 7. I don’t particularly blame you for that, because even the question author doesn’t seem to realize that this problem is NP-complete, but you could have at least mentioned it. There is no way A-star can produce optimal solutions, no matter what heuristic you give it, because it will never revisit a vertex that it previously found on a different path. \$\endgroup\$

Anders Kaseorg
– Anders Kaseorg

2018-07-23 02:35:46 +00:00
Commented Jul 23, 2018 at 2:35

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