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This commit is contained in:
Max Nuding 2021-12-15 14:20:33 +01:00
parent 07ac0b2fc5
commit 2239760ce2
Signed by: phlaym
GPG Key ID: A06651BAB6777237
1 changed files with 23 additions and 11 deletions
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34
Sources/15/15.swift
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@ -29,7 +29,6 @@ struct Coord: Hashable, CustomStringConvertible {
class Day15: Runnable {
let inputPath: String
var field = [Coord]()
var lastRow: Int = 0
var lastCol: Int = 0
var parts = [[ThreatLevel]]()
@ -71,22 +70,29 @@ class Day15: Runnable {
lastRow = parts.count - 1
lastCol = (parts.first?.count ?? 0) - 1
var unvisited = Set<Coord>()
// Distances to startNode
var totalThreatLevel = [Coord: ThreatLevel]()
for row in parts.enumerated() {
for col in row.element.indices {
let c = Coord(row: row.offset, col: col)
unvisited.insert(c)
//totalThreatLevel[c] = Int.max
}
var unvisited = Set(parts.enumerated().flatMap {row in
row.element.indices.map { col in
Coord(row: row.offset, col: col)
}
})
var threatLevelDistrubution = [ThreatLevel: Set<Coord>]()
let startNode = Coord(row: 0, col: 0)
totalThreatLevel[startNode] = 0
threatLevelDistrubution[Int.max] = unvisited
threatLevelDistrubution[Int.max]!.remove(startNode)
threatLevelDistrubution[0] = Set([startNode])
while let currentNode = unvisited.min(by: { totalThreatLevel[$0, default: Int.max] < totalThreatLevel[$1, default: Int.max] }) {
//var currentNode = !
while let threatLevel = threatLevelDistrubution.keys.min() {
let currentNode = threatLevelDistrubution[threatLevel]!.first!
unvisited.remove(currentNode)
threatLevelDistrubution[threatLevel]!.remove(currentNode)
if threatLevelDistrubution[threatLevel]!.isEmpty {
threatLevelDistrubution.removeValue(forKey: threatLevel)
}
if neighbors[currentNode] == nil {
neighbors[currentNode] = currentNode
.neighbors()
@ -103,8 +109,14 @@ class Day15: Runnable {
let currentThreatLevel = totalThreatLevel[currentNode, default: Int.max]
for a in adjacent {
let testCost = parts[a] + currentThreatLevel
if totalThreatLevel[a, default: Int.max] > testCost {
let currentCost = totalThreatLevel[a, default: Int.max]
if currentCost > testCost {
totalThreatLevel[a] = testCost
threatLevelDistrubution[currentCost]!.remove(a)
threatLevelDistrubution[testCost, default: Set<Coord>()].insert(a)
if threatLevelDistrubution[currentCost]!.isEmpty {
threatLevelDistrubution.removeValue(forKey: currentCost)
}
}
}
}