Added day 4 solutions

HarshilShah · Dec 4, 2022 · 6ec3f5a · 6ec3f5a
1 parent 2051b7c
commit 6ec3f5a
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Showing 2 changed files with 43 additions and 1 deletion.
diff --git a/2022/Sources/2022/Day4.swift b/2022/Sources/2022/Day4.swift
@@ -0,0 +1,42 @@
+import Algorithms
+import Collections
+import Foundation
+
+extension ClosedRange {
+	func contains(_ other: ClosedRange) -> Bool {
+		other.clamped(to: self) == other
+	}
+}
+
+struct Day4: Day {
+	var input: String
+
+	init(input: String) {
+		self.input = input
+	}
+
+	func partOne() -> String {
+		input
+			.split(separator: "\n")
+			.lazy
+			.map(parse)
+			.filter { $0.0.contains($0.1) || $0.1.contains($0.0) }
+			.count
+			.description
+	}
+
+	func partTwo() -> String {
+		input
+			.split(separator: "\n")
+			.lazy
+			.map(parse)
+			.filter { $0.0.overlaps($0.1) }
+			.count
+			.description
+	}
+
+	func parse(_ line: Substring) -> (ClosedRange<Int>, ClosedRange<Int>) {
+		let numbers = line.split(whereSeparator: { $0.isNumber == false }).map { Int($0)! }
+		return (numbers[0] ... numbers[1], numbers[2] ... numbers[3])
+	}
+}
diff --git a/2022/Sources/2022/main.swift b/2022/Sources/2022/main.swift
@@ -1,6 +1,6 @@
 import Foundation
 
-typealias CurrentDay = Day3
+typealias CurrentDay = Day4
 
 let testInput = """
 <Insert your test input here>