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+ defaultConfigurationIsVisible = 0; + defaultConfigurationName = Release; + }; +/* End XCConfigurationList section */ + }; + rootObject = 268D953125781DD80030EC4D /* Project object */; +} diff --git a/AdventOfCode2020.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/AdventOfCode2020.xcodeproj/project.xcworkspace/contents.xcworkspacedata new file mode 100644 index 0000000..919434a --- /dev/null +++ b/AdventOfCode2020.xcodeproj/project.xcworkspace/contents.xcworkspacedata @@ -0,0 +1,7 @@ + + + + + diff --git a/AdventOfCode2020.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/AdventOfCode2020.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist new file mode 100644 index 0000000..18d9810 --- /dev/null +++ b/AdventOfCode2020.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist @@ -0,0 +1,8 @@ + + + + + IDEDidComputeMac32BitWarning + + + diff --git a/common/LoadData.swift b/common/LoadData.swift new file mode 100644 index 0000000..322be0f --- /dev/null +++ b/common/LoadData.swift @@ -0,0 +1,30 @@ +import Foundation + +func loadData(day: Int) -> String { + guard let session = getenv("SESSION") else { + fatalError("Missing session env var") + } + + var request = URLRequest(url: URL(string: "https://adventofcode.com/2020/day/\(day)/input")!) + request.setValue("session=\(String(cString: session))", forHTTPHeaderField: "Cookie") + + var result: String? = nil + + let group = DispatchGroup() + + group.enter() + let task = URLSession.shared.dataTask(with: request) { (data, response, error) in + guard error == nil, let data = data, let response = response as? HTTPURLResponse, response.statusCode == 200 else { + fatalError("Cannot get input from server") + } + + result = String(data: data, encoding: .utf8) + group.leave() + } + + task.resume() + + group.wait() + + return result! +} diff --git a/common/Scanner+Extensions.swift b/common/Scanner+Extensions.swift new file mode 100644 index 0000000..9a57bbd --- /dev/null +++ b/common/Scanner+Extensions.swift @@ -0,0 +1,26 @@ +import Foundation + +extension Scanner { + @discardableResult + func string(_ string: String) -> Bool { + return scanString(string) != nil + } + + func integers() -> [Int]? { + var numbers: [Int] = [] + while !isAtEnd { + guard let num = scanInt() else { return nil } + numbers.append(num) + } + return numbers + } +} + + +extension String { + func lines() -> [String] { + var result: [String] = [] + enumerateLines { line, _ in result.append(line) } + return result + } +} diff --git a/day1/main.swift b/day1/main.swift new file mode 100644 index 0000000..a70f62f --- /dev/null +++ b/day1/main.swift @@ -0,0 +1,21 @@ +import Foundation + +let input = Scanner(string: loadData(day: 1)).integers()! + +for i in 0.. $1 } +adapters.append(0) + + +let device = adapters[0] + 3 + +var current = device +var ones = 0 +var threes = 0 + +for adapter in adapters { + let step = current - adapter + if step == 3 { + threes += 1 + } else if step == 1 { + ones += 1 + } else if step != 2 { + print("fail") + } + current = adapter +} + +print("part 1", ones * threes) + +struct Key: Hashable { + var start: Int + var max: Int +} +var memo: [Key: Int] = [:] + +func findPaths(start: Int, max: Int) -> Int { + if let value = memo[Key(start: start, max: max)] { + return value + } + + let diff = max - adapters[start] + if diff > 3 || diff < 1 { + return 0 + } + + if start == adapters.count - 1 { + return 1 + } + + var result = 0 + for n in (start + 1)..<(adapters.count) { + let next = findPaths(start: n, max: adapters[start]) + if next == 0 { + break + } + result += next + } + + memo[Key(start: start, max: max)] = result + + return result +} + +print(findPaths(start: 0, max: device)) diff --git a/day11/main.swift b/day11/main.swift new file mode 100644 index 0000000..f8be0a0 --- /dev/null +++ b/day11/main.swift @@ -0,0 +1,116 @@ +import Foundation + +let input = loadData(day: 11) + +enum Spot: Equatable { + case empty + case occupied + case floor +} +typealias Map = [[Spot]] + +var map: Map = [] + +input.enumerateLines { (line, _) in + map.append(line.map { + switch $0 { + case ".": return .floor + case "#": return .occupied + case "L": return .empty + default: fatalError("Invalid input") + } + }) +} + + +let adjacents = [ + (-1, -1), + (0, -1), + (1, -1), + (-1, 0), + (1, 0), + (-1, 1), + (0, 1), + (1, 1) +] + +/* + func step(map: Map) -> Map { + var result = map + let width = map[0].count + + for i in 0..= 4: result[i][j] = .empty + default: break + } + } + } + + return result + } + + */ + +func occupiedInDirection(at pos: (Int, Int), map: Map, direction: (Int, Int)) -> Int { + var pos = pos + + let yRange = 0.. Map { + var result = map + let width = map[0].count + + for i in 0..= 5: result[i][j] = .empty + default: break + } + } + } + + return result +} + + +while true { + let next = step(map: map) + if next == map { + break + } + map = next +} + +let totalOccupieds = map.lazy.flatMap { $0 }.filter { $0 == .occupied }.count +print(totalOccupieds) diff --git a/day2/main.swift b/day2/main.swift new file mode 100644 index 0000000..54879b3 --- /dev/null +++ b/day2/main.swift @@ -0,0 +1,39 @@ +import Foundation + +let input = loadData(day: 2) + +var valids = 0 +var valid2 = 0 + +var scanner = Scanner(string: input) +while !scanner.isAtEnd { + guard let min = scanner.scanInt(), + scanner.scanString("-") != nil, + let max = scanner.scanInt(), + let character = scanner.scanCharacter(), + scanner.scanString(":") != nil, + let password = scanner.scanUpToCharacters(from: .newlines) + else { + fatalError("Invalid input"); + } + + + let count = password.lazy.filter { $0 == character }.count + + if min <= count && count <= max { + print("valid", min, max, character, password) + valids += 1 + } + + let first = password.index(password.startIndex, offsetBy: min - 1, limitedBy: password.endIndex).map { password[$0] } + let second = password.index(password.startIndex, offsetBy: max - 1, limitedBy: password.endIndex).map { password[$0] } + + if (first == character || second == character) && first != second { + print("valid 2", password) + valid2 += 1 + } + +} + +print("Valid old", valids) +print("Valid new", valid2) diff --git a/day3/main.swift b/day3/main.swift new file mode 100644 index 0000000..9f7392d --- /dev/null +++ b/day3/main.swift @@ -0,0 +1,32 @@ +let input = loadData(day: 3).lines() + +/// - returns true if a tree is at that position, false if it is empty +func get(x: Int, y: Int) -> Bool { + let line = input[y] + let index = line.index(line.startIndex, offsetBy: x % line.count) + return line[index] == "#" +} + +func calculate(dx: Int, dy: Int) -> Int { +var x = 0 +var y = 0 + +var trees = 0 + +while y < input.count { + if get(x: x, y: y) { + trees += 1 + } + + x += dx + y += dy +} + + return trees +} + +let trees = calculate(dx: 3, dy: 1) +print("trees", trees) + + +print("combined", calculate(dx: 1, dy: 1) * calculate(dx: 3, dy: 1) * calculate(dx: 5, dy: 1) * calculate(dx: 7, dy: 1) * calculate(dx: 1, dy: 2)) diff --git a/day4/main.swift b/day4/main.swift new file mode 100644 index 0000000..ae1542e --- /dev/null +++ b/day4/main.swift @@ -0,0 +1,99 @@ +import Foundation + +let input = loadData(day: 4) + +let scanner = Scanner(string: input) +scanner.charactersToBeSkipped = nil + +extension Scanner { + func field() -> (String, String)? { + guard let name = scanUpToString(":"), + scanString(":") != nil, + let value = scanUpToCharacters(from: .whitespacesAndNewlines) + else { return nil } + return (name, value) + } + + func passport() -> [String: String]? { + var fields = [(String, String)]() + while !isAtEnd && scanString("\n\n") == nil { + _ = scanner.scanCharacters(from: .whitespacesAndNewlines) + guard let field = field() else { return nil } + fields.append(field) + } + return try? Dictionary(fields, uniquingKeysWith: { _, _ in throw NSError(domain: "error", code: 1, userInfo: nil) }) + } +} + +var valids = 0 +var valid2 = 0 + +let requiredFields = [ + "byr", + "iyr", + "eyr", + "hgt", + "hcl", + "ecl", + "pid", +] + +func validHeight(_ height: String) -> Bool { + let scanner = Scanner(string: height) + guard let number = scanner.scanInt() else { return false } + if scanner.scanString("cm") != nil, 150...193 ~= number { + return true + } + + if scanner.scanString("in") != nil, 59...76 ~= number { + return true + } + + return false +} + +func validHairColor(_ hcl: String) -> Bool { + let scanner = Scanner(string: hcl) + guard scanner.scanString("#") != nil else { return false } + guard scanner.scanCharacters(from: CharacterSet(charactersIn: "0123456789abcdef"))?.count == 6 else { return false } + return scanner.isAtEnd +} + +let validEyeColors: Set = [ + "amb", + "blu", + "brn", + "gry", + "grn", + "hzl", + "oth" +] + +func isValidPassportId(_ pid: String) -> Bool { + return pid.count == 9 && Int(pid) != nil +} + +while !scanner.isAtEnd { + guard let passport = scanner.passport() else { fatalError() } + print(passport) + + let valid = requiredFields.allSatisfy { passport.keys.contains($0) } + if valid { + valids += 1 + } + + guard let year = passport["byr"].flatMap(Int.init), 1920...2002 ~= year else { continue } + guard let issueYear = passport["iyr"].flatMap(Int.init), 2010...2020 ~= issueYear else { continue } + guard let expireYear = passport["eyr"].flatMap(Int.init), 2020...2030 ~= expireYear else { continue } + guard let height = passport["hgt"], validHeight(height) else { continue } + guard let hairColor = passport["hcl"], validHairColor(hairColor) else { continue } + guard let eyeColor = passport["ecl"], validEyeColors.contains(eyeColor) else { continue } + guard let pid = passport["pid"], isValidPassportId(pid) else { continue } + + valid2 += 1 + +} + +print("valids", valids) +print("valid2", valid2) + diff --git a/day5/main.swift b/day5/main.swift new file mode 100644 index 0000000..687c52d --- /dev/null +++ b/day5/main.swift @@ -0,0 +1,35 @@ +let input = loadData(day: 5).lines() + +func decode(_ s: Substring, lower: Character, upper: Character, range: Range) -> (Int, Substring) +{ + var range = range + var start = s.startIndex + while start != s.endIndex && (s[start] == lower || s[start] == upper) { + let mid = (range.lowerBound + range.upperBound) / 2 + if s[start] == lower { + range = range.lowerBound.. Int { + let (row, rest) = decode(s[...], lower: "F", upper: "B", range: 0..<128) + let (column, _) = decode(rest, lower: "L", upper: "R", range: 0..<8) + let id = row * 8 + column + print(s, row, column, id) + return id +} + +let foundSeats = Set(input.map { decodeSeat($0) }) +print("max seat id", foundSeats.max() ?? -1) + +let allSeats = Set(0...(7+127*8)) +let freeSeats = allSeats.subtracting(foundSeats) + +let yours = freeSeats.first(where: { foundSeats.contains($0 + 1) && foundSeats.contains($0 - 1)}) +print("yours", yours ?? -1) diff --git a/day6/main.swift b/day6/main.swift new file mode 100644 index 0000000..5edf2f9 --- /dev/null +++ b/day6/main.swift @@ -0,0 +1,34 @@ +import Foundation + +var input = loadData(day: 6) + +let scanner = Scanner(string: input) +scanner.charactersToBeSkipped = nil + +var count = 0 +var countB = 0 +var currentGroup: [Character:Int] = [:] +var peopleInGroup = 0 + +repeat { + guard let answers = scanner.scanUpToString("\n") else { fatalError() } + peopleInGroup += 1 + _ = scanner.scanString("\n") + + for answer in answers { + currentGroup[answer, default: 0] += 1 + } + + if scanner.isAtEnd || scanner.scanString("\n") != nil { + count += currentGroup.count + + countB += currentGroup.lazy.filter { $1 == peopleInGroup }.count + + currentGroup.removeAll(keepingCapacity: true) + peopleInGroup = 0 + } + +} while !scanner.isAtEnd + +print("count", count) +print("part 2", countB) diff --git a/day7/main.swift b/day7/main.swift new file mode 100644 index 0000000..622a0ec --- /dev/null +++ b/day7/main.swift @@ -0,0 +1,74 @@ +import Foundation + +let input = loadData(day: 7) + + +let scanner = Scanner(string: input) + +struct Rule { + var count: Int + var color: String +} + +extension Scanner { + func scanRule() -> Rule? { + guard let count = scanInt(), + let color = scanUpToString(count == 1 ? " bag" : " bags"), + scanString(count == 1 ? "bag" : "bags") != nil + else { return nil } + return Rule(count: count, color: color) + } + + func scanRuleSet() -> (String, [Rule])? { + guard + let color = scanUpToString(" bags contain"), + scanString("bags contain") != nil else { return nil } + if scanString("no other bags.") != nil { + return (color, []) + } + + var rules: [Rule] = [] + repeat { + guard let rule = scanRule() else { return nil } + rules.append(rule) + } while scanString(",") != nil + + guard scanString(".") != nil else { return nil } + + return (color, rules) + } + + func scanAllRules() -> [String: [Rule]]? { + var result: [String: [Rule]] = [:] + while !isAtEnd { + guard let (color, rules) = scanRuleSet() else { return nil } + result[color] = rules + } + return result + } +} + +guard let rules = scanner.scanAllRules() else { fatalError() } +//print(rules) + +func findPath(rules: [String: [Rule]], from: String, to: String) -> Bool { + guard let from = rules[from] else { return false } + if from.contains(where: { $0.color == to }) { + return true + } + + return from.contains(where: { findPath(rules: rules, from: $0.color, to: to) }) +} + +let count = rules.lazy.filter { findPath(rules: rules, from: $0.key, to: "shiny gold") }.count + +print("count", count) + +func bagsInside(rules: [String: [Rule]], color: String) -> Int { + guard let from = rules[color] else { return 0 } + return from.reduce(0) { accum, bag in + accum + bag.count + bag.count * bagsInside(rules: rules, color: bag.color) + } +} + +print("total bags", bagsInside(rules: rules, color: "shiny gold")) diff --git a/day8/main.swift b/day8/main.swift new file mode 100644 index 0000000..bf93990 --- /dev/null +++ b/day8/main.swift @@ -0,0 +1,134 @@ +import Foundation + +let input = loadData(day: 8) + +let scanner = Scanner(string: input) + +enum Instruction: String { + case nop + case acc + case jmp +} + +struct Line { + var instruction: Instruction + var argument: Int +} + +extension Scanner { + func instruction() -> Instruction? { + guard let string = scanUpToCharacters(from: .whitespaces), + let instruction = Instruction(rawValue: string) + else { return nil } + return instruction + } + + func line() -> Line? { + guard let ins = instruction(), + let argument = scanInt() + else { return nil } + return Line(instruction: ins, argument: argument) + } + + func program() -> [Line]? { + var program = [Line]() + while !isAtEnd { + guard let line = self.line() else { return nil } + program.append(line) + } + return program + } +} + +class Computer { + var program: [Line] + var ip: Int = 0 + var acc: Int = 0 + + init(program: [Line]) { + self.program = program + } + + var visited: Set = [] + + func runLine() { + let line = program[ip] + switch line.instruction { + case .nop: + ip += 1 + + case .acc: + acc += line.argument + ip += 1 + + case .jmp: + ip += line.argument + } + } + + func run() { + ip = 0 + acc = 0 + + while ip < program.count { + let (inserted, _) = visited.insert(ip) + if !inserted { + print("Repeated instruction", acc) + return + } + + runLine() + } + print("Finished", acc) + } + + func find(ip: Int, acc: Int, changed: Bool, visited: Set) -> Int? + { + if ip >= program.count { + return acc + } + + if (visited.contains(ip)) { + return nil + } + + let newVisited = visited.union([ip]) + + let line = program[ip] + switch line.instruction { + case .acc: + return find(ip: ip + 1, acc: acc + line.argument, changed: changed, visited: newVisited) + + case .nop: + if let result = find(ip: ip + 1, acc: acc, changed: changed, visited: newVisited) { + return result + } + + if !changed, let result = find(ip: ip + line.argument, acc: acc, changed: true, visited: newVisited) { + print("Found result by changing nop to jmp at", ip) + return result + } + + case .jmp: + if let result = find(ip: ip + line.argument, acc: acc, changed: changed, visited: newVisited) { + return result + } + + if !changed, let result = find(ip: ip + 1, acc: acc, changed: true, visited: newVisited) { + print("Found result by changing jmp to nop at", ip) + return result + } + } + + return nil + } +} + +guard let program = scanner.program() else { fatalError() } +let computer = Computer(program: program) +computer.run() +if let found = computer.find(ip: 0, acc: 0, changed: false, visited: []) { + print("found solution", found) +} + + diff --git a/day9/main.swift b/day9/main.swift new file mode 100644 index 0000000..3dbf41a --- /dev/null +++ b/day9/main.swift @@ -0,0 +1,45 @@ +import Foundation + +let input = loadData(day: 9) +let scanner = Scanner(string: input) + +let numbers = scanner.integers()! + +var weakness: Int? = nil +outer: for i in 25.. max { max = n } + if sum == weakness { + print(min + max) + break outer + } + if sum > weakness { + break + } + } +}