day19

Author: spaenleh

Sources/AdventOfCode.swift

@@ -17,7 +17,8 @@ let allChallenges: [any AdventDay] = [
   // Day13(),
   // Day14(),
   // Day15(),
-  Day17()
+  // Day17(),
+  Day19()
 ]
 
 @main

Sources/Day19.swift

@@ -0,0 +1,24 @@
+import Algorithms
+
+struct Day19: AdventDay {
+  var data: String
+
+  func part1() throws -> Int {
+    let parts = data.trimmed().split(separator: "\n\n")
+    let words =
+      "^(\(parts[0].split(separator: ",").map { "(\($0.trimmed()))" }.joined(separator: "|")))*$"
+    let regex = try Regex(words)
+
+    var count = 0
+    for design in parts[1].lines() {
+      if (try? regex.wholeMatch(in: design)) != nil {
+        count += 1
+      }
+    }
+    return count
+  }
+
+  func part2() -> Int {
+    0
+  }
+}

Tests/Day19.swift

@@ -0,0 +1,31 @@
+import Testing
+
+@testable import aoc
+
+@Suite("Day19")
+struct Day19Tests {
+  let testData = """
+    r, wr, b, g, bwu, rb, gb, br
+
+    brwrr
+    bggr
+    gbbr
+    rrbgbr
+    ubwu
+    bwurrg
+    brgr
+    bbrgwb
+    """
+
+  @Test("part1")
+  func testPart1() async throws {
+    let challenge = Day19(data: testData)
+    #expect(try challenge.part1() == 6)
+  }
+
+  @Test("part2")
+  func testPart2() async throws {
+    let challenge = Day19(data: testData)
+    #expect(challenge.part2() == 0)
+  }
+}