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This commit is contained in:
Daniel Flanagan 2021-12-20 09:06:24 -06:00
parent fd99f2bbe4
commit d1f7fe4ecb
Signed by: lytedev
GPG key ID: 5B2020A0F9921EF4
1 changed files with 45 additions and 18 deletions
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2021/nim/day18.nim
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@ -34,36 +34,63 @@ proc nodeAt(node: BinaryTreeNode, path: BinaryTreeNodePath): Option[BinaryTreeNo
of right: curNode = node.left
return some(curNode)
proc crawlFor(node: BinaryTreeNode, predicate: (node: BinaryTreeNode, path: BinaryTreeNodePath) -> bool, path: BinaryTreeNodePath = @[]): Option[BinaryTreeNodePath] =
proc crawlFor(node: BinaryTreeNode, predicate: (node: BinaryTreeNode, path: BinaryTreeNodePath) -> bool, path: BinaryTreeNodePath = @[], preferredSide: BinaryTreeNodePathSegment = left): Option[BinaryTreeNodePath] =
if node.predicate(path): return some(path)
elif node.kind == branch:
if preferredSide == left:
let lp = path & @[left]
let ln = node.left.crawlFor(predicate, lp)
let ln = node.left.crawlFor(predicate, lp, preferredSide)
if ln.isSome: return some(lp)
let rp = path & @[right]
let rn = node.right.crawlFor(predicate, rp)
let rn = node.right.crawlFor(predicate, rp, preferredSide)
if rn.isSome: return some(rp)
else:
let rp = path & @[right]
let rn = node.right.crawlFor(predicate, rp, preferredSide)
if rn.isSome: return some(rp)
let lp = path & @[left]
let ln = node.left.crawlFor(predicate, lp, preferredSide)
if ln.isSome: return some(lp)
return none(BinaryTreeNodePath)
when not defined(release):
block:
let (bt, n) = parseBinaryTree("[[1,2],3]")
assert bt.right.value == 3'u64
assert bt.left.left.value == 1'u64
assert bt.left.right.value == 2'u64
assert n == 9
proc valueLeftOf(node: var BinaryTreeNode, path: BinaryTreeNodePath): Option[BinaryTreeNodePath] =
# for every right in the given path ordered from deepest to shallowest
# go left at that point and find the right-most value if any
# if such a process fails to find anything, there's no possible value
proc valueLeftOf(node: BinaryTreeNode, path: BinaryTreeNodePath): Option[BinaryTreeNodePath] =
var walker = path
while walker.len > 0:
if walker.pop == right:
let subPath = walker & @[left]
echo subPath
let subNode = node.nodeAt(subPath)
if subNode.isSome:
echo subPath, path
echo subNode.get.kind
let candidatePath = subNode.get.crawlFor((n, _) => n.kind == leaf, @[], right)
if candidatePath.isSome: return some(subPath & candidatePath.get)
return none(BinaryTreeNodePath)
proc valueRightOf(node: var BinaryTreeNode, path: BinaryTreeNodePath): Option[BinaryTreeNodePath] =
# see valueLeftOf, but replace left<->right
when not defined(release):
block:
let (bt, _) = parseBinaryTree("[[1,2],3]")
assert bt.valueLeftOf(@[right]) == some(@[left, right])
assert bt.valueLeftOf(@[left, left]) == none(BinaryTreeNodePath)
assert bt.valueLeftOf(@[left, right]) == some(@[left, left])
let (bt2, _) = parseBinaryTree("[1,[2,3]]")
assert bt2.valueLeftOf(@[right, right]) == some(@[right, left])
assert bt2.valueLeftOf(@[right, left]) == some(@[left])
proc explodeAt(node: var BinaryTreeNode, path: BinaryTreeNodePath) =
return
# TODO: implement exploding
proc splitAt(node: var BinaryTreeNode, path: BinaryTreeNodePath) =
return
# TODO: implement exploding
proc p1(input: Lines): uint64 =