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Solution to part (d)
It seems as though A* and dynamic programming are best for this
problem. A* would be best if you were solving it once. If you
wanted to solve it multiple times for the same goal dynamic
programming would be good.
Depth-first search looks pretty stupid given this ordering of
neighbors. If you had searched in the order: left, up, right, down,
depth-first search would have looked much more sensible.
Computational
Intelligence online
material, ©David Poole, Alan Mackworth and Randy Goebel, 1999