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Define equality of MCState #21

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Define equality of MCState #21

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2a46e18
Define equality of MCState
ruddyscent Oct 29, 2023
95f2e06
Generalize hash func for arbitrary MAX_NUM
ruddyscent Oct 29, 2023
1b383d7
Generate fixed size hash value
ruddyscent Oct 29, 2023
f7cdbb2
Make base number bigger than digit
ruddyscent Oct 30, 2023
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10 changes: 10 additions & 0 deletions Chapter2/missionaries.py
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,16 @@ def __str__(self) -> str:
"The boat is on the {} bank.")\
.format(self.wm, self.wc, self.em, self.ec, ("west" if self.boat else "east"))

def __eq__(self, other) -> bool:
return (self.wm == other.wm) and (self.wc == other.wc) and \
(self.em == other.em) and (self.ec == other.ec) and \
(self.boat == other.boat)

def __hash__(self) -> int:
state: int = self.wm * (MAX_NUM + 1)**3 + self.wc * (MAX_NUM + 1)**2 + self.em * (MAX_NUM + 1) + self.ec
state *= 1 if self.boat else -1
return hash(state)

def goal_test(self) -> bool:
return self.is_legal and self.em == MAX_NUM and self.ec == MAX_NUM

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