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day12: go even faster

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This commit is contained in:
Stefan Harmuth 2021-12-12 07:50:58 +01:00
parent 9a327ec92a
commit 03f0491671
1 changed files with 8 additions and 10 deletions
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18
day12.py
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@ -12,29 +12,27 @@ def getCaveMap(lines: List[List[str]]) -> Dict[str, List[str]]:
return m
def getPaths(caveMap: Dict[str, List[str]], start: str, visited: set, noDouble: bool = True) -> List[List[str]]:
paths = []
def getPaths(caveMap: Dict[str, List[str]], start: str, visited: set, noDouble: bool = True) -> int:
pathCount = 0
visited.add(start)
for thisCave in caveMap[start]:
if thisCave == 'start':
continue
if thisCave == 'end':
paths.append(['end'])
pathCount += 1
continue
foundDouble = False
if thisCave.islower() and thisCave in visited:
if noDouble:
continue
foundDouble = True
sub_paths = getPaths(caveMap, thisCave, visited.copy(), noDouble or foundDouble)
for x in sub_paths:
if 'end' in x:
paths.append(x)
pathCount += getPaths(caveMap, thisCave, visited.copy(), noDouble or foundDouble)
return paths
return pathCount
class Day(AOCDay):
@ -43,8 +41,8 @@ class Day(AOCDay):
def part1(self) -> Any:
caveMap = getCaveMap(self.getInputAsArraySplit("-"))
return len(getPaths(caveMap, 'start', set()))
return getPaths(caveMap, 'start', set())
def part2(self) -> Any:
caveMap = getCaveMap(self.getInputAsArraySplit("-"))
return len(getPaths(caveMap, 'start', set(), False))
return getPaths(caveMap, 'start', set(), False)