This commit is contained in:
Max Nuding 2021-12-15 12:00:41 +01:00
parent 5780588903
commit f6fa8e6b6a
Signed by: phlaym
GPG Key ID: A06651BAB6777237
5 changed files with 231 additions and 1 deletions

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@ -23,7 +23,8 @@ let package = Package(
.executable(name: "11", targets: ["11"]),
.executable(name: "12", targets: ["12"]),
.executable(name: "13", targets: ["13"]),
.executable(name: "14", targets: ["14"])
.executable(name: "14", targets: ["14"]),
.executable(name: "15", targets: ["15"])
],
dependencies: [
// Dependencies declare other packages that this package depends on.
@ -112,5 +113,11 @@ let package = Package(
name: "14",
dependencies: [ .targetItem(name: "Runner", condition: nil) ]
)
,
.executableTarget(
name: "15",
dependencies: [ .targetItem(name: "Runner", condition: nil),
.product(name: "Collections", package: "swift-collections")]
)
]
)

101
Sources/15/15.swift Normal file
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@ -0,0 +1,101 @@
//
// File.swift
//
//
// Created by Max Nuding on 15s.12.21.
//
import Foundation
import Runner
import Collections
typealias ThreatLevel = Int
struct Coord: Hashable, CustomStringConvertible {
let row: Int
let col: Int
var description: String { "(\(row), \(col))" }
func neighbors() -> [Coord] {
[
Coord(row: row-1, col: col),
Coord(row: row, col: col+1),
Coord(row: row+1, col: col),
Coord(row: row, col: col-1)
]
}
}
class Day15: Runnable {
let inputPath: String
var field = [Coord]()
var lastRow: Int = 0
var lastCol: Int = 0
var parts = [[ThreatLevel]]()
var neighbors = [Coord: [Coord]]()
required init(inputPath: String) {
self.inputPath = inputPath
}
public func run() {
let input = try! String(contentsOfFile: inputPath)
parts = input
.trimmingCharacters(in: .newlines)
.components(separatedBy: .newlines)
.map { Array($0) }
.map { ar in ar.map {c in ThreatLevel(c.description)!} }
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
}
}
let startNode = Coord(row: 0, col: 0)
totalThreatLevel[startNode] = 0
while let currentNode = unvisited.min(by: { totalThreatLevel[$0, default: Int.max] < totalThreatLevel[$1, default: Int.max] }) {
//var currentNode = !
unvisited.remove(currentNode)
if neighbors[currentNode] == nil {
neighbors[currentNode] = currentNode
.neighbors()
.filter {
$0.col >= 0 && $0.col <= lastCol && $0.row >= 0 && $0.row <= lastRow
}
}
var adjacent = neighbors[currentNode]!
neighbors[currentNode] = adjacent
adjacent = adjacent
.filter {
unvisited.contains($0)
}
let currentThreatLevel = totalThreatLevel[currentNode, default: Int.max]
for a in adjacent {
let testCost = parts[a] + currentThreatLevel
if totalThreatLevel[a, default: Int.max] > testCost {
totalThreatLevel[a] = testCost
}
}
}
print(totalThreatLevel[Coord(row: lastRow, col: lastCol)]!)
}
}
extension Array where Element == Array<Int> {
subscript(coord: Coord) -> Int {
get { self[coord.row][coord.col] }
set(newValue) {
self[coord.row][coord.col] = newValue
}
}
}

12
Sources/15/main.swift Normal file
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@ -0,0 +1,12 @@
//
// File.swift
//
//
// Created by Max Nuding on 15.12.21.
//
import Foundation
import Runner
//Runner(target: Day15.self, day: "15", isTest: true).run()
Runner(target: Day15.self, day: "15", isTest: false).run()

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