Day 18
This commit is contained in:
parent
3ba710552d
commit
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2 changed files with 403 additions and 0 deletions
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@ -21,6 +21,8 @@
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@ -106,6 +108,15 @@
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@ -161,6 +172,8 @@
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265112962767D16D009B7607 /* day13.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = day13.swift; sourceTree = "<group>"; };
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269BE5B42762958800871C85 /* Day8Part2 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = Day8Part2; sourceTree = BUILT_PRODUCTS_DIR; };
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@ -229,6 +242,13 @@
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@ -263,6 +283,7 @@
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children = (
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263D3E41276E10AE00B0AC5B /* day18.swift */,
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263D3E32276DDA6600B0AC5B /* day17.swift */,
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26EA5DFF276BA680003E0305 /* day16.swift */,
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26155467276A6D0A00374D18 /* day15.swift */,
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@ -295,6 +316,7 @@
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26155460276A6CF700374D18 /* Day15 */,
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26EA5DF7276BA668003E0305 /* Day16 */,
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263D3E2B276DDA5400B0AC5B /* Day17 */,
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263D3E39276E109D00B0AC5B /* Day18 */,
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@ -438,6 +460,23 @@
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buildRules = (
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dependencies = (
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name = Day18;
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productName = Day18;
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@ -547,6 +586,9 @@
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CreatedOnToolsVersion = 13.2;
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@ -588,6 +630,7 @@
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@ -665,6 +708,15 @@
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318
day18.swift
Normal file
318
day18.swift
Normal file
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@ -0,0 +1,318 @@
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import Foundation
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@main
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struct Day18: Puzzle {
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func run() {
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let pairs = Scanner(string: input).all()
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let first = pairs[0]
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let result = pairs.dropFirst().reduce(first, +)
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print(result.toString())
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print("Part 1:", result.magnitude())
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var largest = 0
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for a in pairs {
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for b in pairs where a !== b {
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largest = max(largest, (a + b).magnitude())
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largest = max(largest, (b + a).magnitude())
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}
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}
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print("Part 2:", largest)
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}
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}
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extension Scanner {
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func pair() -> Pair? {
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guard scanString("[") != nil else { return nil }
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guard let leftPart = part() else { return nil }
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guard scanString(",") != nil else { return nil }
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guard let rightPart = part() else { return nil }
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guard scanString("]") != nil else { return nil }
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return Pair(leftPart, rightPart)
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}
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func part() -> Number? {
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if let digits = scanInt() {
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return Regular(value: digits)
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}
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return pair()
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}
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func all() -> [Pair] {
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var result: [Pair] = []
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while let pair = self.pair() {
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result.append(pair)
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}
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assert(isAtEnd)
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return result
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}
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}
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struct ExplodeContext {
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var lastRegular: Regular? = nil
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var addToNextNumber: Int? = nil
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var didExplode = false
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}
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enum Action {
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case goOn
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case stop
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case replace(Number)
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}
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protocol Number: AnyObject {
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func toString() -> String
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func visitExplode(depth: Int, context: inout ExplodeContext) -> Action
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func visitSplit(didSplit: inout Bool) -> Action
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func magnitude() -> Int
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func copy() -> Number
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}
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extension Number where Self == Pair {
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static func parse(_ string: String) -> Self {
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Scanner(string: string).pair()!
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}
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}
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class Regular: Number {
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var value: Int
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init(value: Int) {
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self.value = value
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}
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func toString() -> String {
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"\(value)"
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}
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func visitExplode(depth: Int, context: inout ExplodeContext) -> Action {
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if let add = context.addToNextNumber {
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value += add
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return .stop
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}
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context.lastRegular = self
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return .goOn
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}
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func visitSplit(didSplit: inout Bool) -> Action {
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if value >= 10 {
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let first = value / 2
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didSplit = true
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return .replace(Pair(Regular(value: first), Regular(value: value - first)))
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}
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return .goOn
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}
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func magnitude() -> Int {
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value
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}
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func copy() -> Number { Regular(value: value) }
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}
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class Pair: Number {
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var left: Number
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var right: Number
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init(_ left: Number, _ right: Number) {
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self.left = left
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self.right = right
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}
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func toString() -> String {
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"[\(left.toString()), \(right.toString())]"
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}
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func splitFirst() -> Bool {
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var didSplit = false
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_ = visitSplit(didSplit: &didSplit)
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return didSplit
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}
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func explodeFirst() -> Bool {
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var context = ExplodeContext()
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_ = visitExplode(depth: 0, context: &context)
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return context.didExplode
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}
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func reduce() -> Pair {
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while true {
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if explodeFirst() { continue }
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if splitFirst() { continue }
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break
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}
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return self
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}
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func visitExplode(depth: Int, context: inout ExplodeContext) -> Action {
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if !context.didExplode && depth == 4 {
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context.lastRegular?.value += (left as! Regular).value
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context.addToNextNumber = (right as! Regular).value
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context.didExplode = true
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return .replace(Regular(value: 0))
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}
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switch left.visitExplode(depth: depth + 1, context: &context) {
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case .goOn:
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break
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case .stop:
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return .stop
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case .replace(let number):
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left = number
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break
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}
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let result = right.visitExplode(depth: depth + 1, context: &context)
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switch result {
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case .goOn:
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return .goOn
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case .stop:
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return .stop
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case .replace(let number):
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right = number
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return .goOn
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}
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}
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func visitSplit(didSplit: inout Bool) -> Action {
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switch left.visitSplit(didSplit: &didSplit) {
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case .goOn: break
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case .stop: return .stop
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case .replace(let new):
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left = new
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return .stop
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}
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switch right.visitSplit(didSplit: &didSplit) {
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case .goOn: return .goOn
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case .stop: return .stop
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case .replace(let new):
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right = new
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return .stop
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}
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}
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func magnitude() -> Int {
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3 * left.magnitude() + 2 * right.magnitude()
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}
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func copy() -> Number {
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Pair(left.copy(), right.copy())
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}
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}
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func +(lhs: Number, rhs: Number) -> Pair {
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Pair(lhs.copy(), rhs.copy()).reduce()
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}
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let input = """
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[4,[3,[9,[9,0]]]]
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[[[7,6],[2,[2,5]]],[5,[[7,3],8]]]
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[4,[4,6]]
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[[0,[5,6]],[[[1,3],[2,7]],[[0,6],4]]]
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[6,[[3,[6,0]],3]]
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[[7,[9,[8,5]]],[6,7]]
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[[[[2,6],1],2],[3,[8,4]]]
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[4,[[[5,4],[2,7]],[[8,0],[2,3]]]]
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[[[[4,3],2],[[3,6],[2,5]]],[[[3,7],8],0]]
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[[[8,[0,7]],1],[[9,[3,9]],9]]
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[[[[3,0],[1,3]],[[0,9],8]],[[[7,2],9],[[1,4],[3,5]]]]
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[[[[9,6],[4,4]],[1,3]],[[4,3],[[6,4],[8,4]]]]
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[[[1,2],[[7,6],[2,3]]],[[4,6],[4,2]]]
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[[[4,8],[[5,8],1]],[2,3]]
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[[[5,2],[3,[5,7]]],[[2,9],5]]
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[[[6,[3,2]],[2,6]],[[8,[4,2]],[[5,2],7]]]
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[[[[2,6],[0,1]],[7,[3,6]]],[[1,6],[[7,9],0]]]
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[[[0,3],[8,1]],[[[9,0],3],[0,2]]]
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[[8,[[7,1],[4,7]]],[[0,[1,3]],[8,2]]]
|
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[[[[2,3],4],[[0,8],[9,0]]],[1,[[5,3],4]]]
|
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[[[[7,2],2],[[1,3],[8,3]]],[4,[[7,9],[0,6]]]]
|
||||
[[[[2,2],[3,4]],[[1,5],[4,3]]],[6,[[7,2],1]]]
|
||||
[1,[[[5,7],0],[9,[8,8]]]]
|
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[[[[9,2],[0,9]],[4,[7,8]]],[[4,8],[[1,8],[4,9]]]]
|
||||
[[[[4,7],2],2],4]
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[1,[[2,[4,2]],1]]
|
||||
[[[[7,2],[3,8]],[0,[1,3]]],[[[4,4],[2,4]],[8,2]]]
|
||||
[[[[1,0],[0,5]],2],[[9,[5,0]],[[1,6],5]]]
|
||||
[4,[[[8,1],[1,4]],[7,[1,3]]]]
|
||||
[[[6,[0,4]],[[4,6],[2,4]]],[9,[1,5]]]
|
||||
[[[[3,6],[3,3]],1],[0,[[8,8],2]]]
|
||||
[[7,[5,[2,6]]],[[[7,9],6],[0,[3,6]]]]
|
||||
[[[[6,7],4],[[2,9],2]],3]
|
||||
[[[7,[1,7]],[5,4]],[[[1,1],[0,1]],5]]
|
||||
[[6,[[1,0],6]],[0,[6,[0,5]]]]
|
||||
[[[[2,4],[4,6]],9],[4,[[8,0],7]]]
|
||||
[[[[9,9],[5,7]],[9,[8,6]]],[[3,[2,3]],0]]
|
||||
[[0,[1,[5,3]]],[3,[8,[3,4]]]]
|
||||
[[[[4,3],8],[2,9]],[[1,[6,5]],[[5,7],2]]]
|
||||
[[[0,[7,4]],[9,[9,6]]],[[8,[5,5]],[[6,4],1]]]
|
||||
[[[[7,3],[7,9]],[8,[6,2]]],[[8,[4,5]],[[6,4],[6,7]]]]
|
||||
[[7,[[9,0],[9,0]]],[[[0,8],2],[8,[8,3]]]]
|
||||
[4,[7,[5,6]]]
|
||||
[7,[[[3,8],8],3]]
|
||||
[[[4,[6,6]],0],[9,0]]
|
||||
[[[[7,4],8],8],[[0,1],[[0,0],[2,4]]]]
|
||||
[7,[1,[[9,4],[3,6]]]]
|
||||
[[[[2,8],9],[[8,6],[2,2]]],[[[5,1],9],[2,[0,7]]]]
|
||||
[8,7]
|
||||
[[[[0,8],4],[[9,9],[9,9]]],[[[4,3],[1,0]],[6,8]]]
|
||||
[[[[8,3],[8,9]],1],[[4,[1,0]],[[4,0],[2,3]]]]
|
||||
[[[[4,7],[1,3]],[6,9]],[[1,0],[[1,8],5]]]
|
||||
[[2,[4,[6,5]]],[3,[[9,9],5]]]
|
||||
[[[[7,6],4],9],[8,[4,5]]]
|
||||
[[[0,[6,6]],[7,[8,9]]],[[[0,0],[3,4]],[4,[1,8]]]]
|
||||
[[[9,[7,0]],[5,8]],[6,[[5,0],[0,6]]]]
|
||||
[[[[4,0],[1,9]],[7,[3,6]]],[[2,[8,6]],[[2,8],[8,2]]]]
|
||||
[[[9,6],8],[[[5,5],[4,8]],0]]
|
||||
[[[[1,7],1],2],[[[6,8],3],[[3,3],5]]]
|
||||
[3,[5,[[3,8],6]]]
|
||||
[3,[[[9,6],[5,8]],[9,2]]]
|
||||
[[6,1],[6,4]]
|
||||
[[2,6],[[[1,2],2],8]]
|
||||
[[[[1,7],[3,6]],[2,[0,2]]],[[3,0],9]]
|
||||
[1,[[0,[4,9]],5]]
|
||||
[[[[5,5],[5,2]],[0,[6,4]]],8]
|
||||
[0,[7,[[6,9],[6,0]]]]
|
||||
[[[[2,2],[4,7]],[[7,4],6]],[[0,[1,7]],[[3,2],6]]]
|
||||
[[9,8],0]
|
||||
[[[[5,4],[4,8]],2],[3,[8,9]]]
|
||||
[[[[7,0],8],5],[2,6]]
|
||||
[[[5,[0,8]],5],[[[5,0],[1,8]],[[0,2],7]]]
|
||||
[[[[9,4],8],[[6,5],4]],[[5,[8,9]],[4,[0,4]]]]
|
||||
[[[[3,6],7],[[9,3],7]],[7,[[8,3],9]]]
|
||||
[[[[0,7],5],[[5,7],2]],[[2,[9,5]],[[7,7],[5,0]]]]
|
||||
[[[[7,5],2],[8,6]],[[2,[6,2]],[5,[3,1]]]]
|
||||
[[9,[9,1]],6]
|
||||
[[[0,7],[[5,9],2]],3]
|
||||
[[[9,3],[8,8]],[0,[4,5]]]
|
||||
[[[[6,2],5],[4,[3,1]]],[9,[2,8]]]
|
||||
[[[1,[9,4]],[[0,0],2]],[[1,[2,1]],[[7,8],[3,2]]]]
|
||||
[[[[0,6],[8,9]],[[4,7],[5,6]]],[[[1,4],[8,7]],[4,6]]]
|
||||
[[[[6,4],[1,5]],[0,8]],[[[9,7],[1,2]],[9,4]]]
|
||||
[[[[4,5],[0,7]],[9,[1,8]]],[[[5,0],6],7]]
|
||||
[[[0,[6,9]],[5,[5,6]]],7]
|
||||
[[4,5],[[7,[6,5]],1]]
|
||||
[[[7,9],[6,7]],[4,1]]
|
||||
[[[[9,6],1],[[3,1],[9,7]]],[1,[7,1]]]
|
||||
[[[0,[2,0]],5],[[8,[7,6]],[[7,3],4]]]
|
||||
[[[6,[1,7]],[9,[2,7]]],3]
|
||||
[[[6,[8,2]],5],[4,[[1,3],[5,1]]]]
|
||||
[[[4,[3,3]],[4,[2,4]]],[5,4]]
|
||||
[[[1,6],[4,[4,0]]],[[8,[2,2]],[[8,1],[4,7]]]]
|
||||
[[2,0],[[2,1],[[4,8],[2,7]]]]
|
||||
[9,[[8,4],0]]
|
||||
[[1,6],[[5,[1,3]],[9,[0,9]]]]
|
||||
[[[0,[3,5]],3],[[2,[8,0]],[[2,0],[4,3]]]]
|
||||
[[[1,[1,9]],[9,[7,9]]],[[2,2],[[6,7],[0,7]]]]
|
||||
[[[4,6],[[6,2],[0,9]]],[[1,0],[1,[6,7]]]]
|
||||
[9,[[[0,1],4],[[9,3],3]]]
|
||||
"""
|
||||
Loading…
Add table
Reference in a new issue