Prep for 3

AoC1/main.swift

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+//
+//  main.swift
+//  AoC1
+//
+//  Created by Marijn Doeve on 01-12-2021.
+//
+
+import Foundation
+
+var depths = [Int]()
+
+let fileContent = try! String(contentsOfFile: CommandLine.arguments[1])
+for line in fileContent.components(separatedBy: .newlines) {
+    if let line = Int(line) {
+        depths.append(line)
+    }
+}
+
+var total = 0
+
+for i in 1..<depths.count {
+    if depths[i - 1] < depths[i] {
+        total += 1
+    }
+}
+
+print("a:", total)
+
+var prev = 1000000
+total = 0
+
+for i in 1..<depths.count - 2 {
+    let new = depths[i..<i + 3].reduce(0, +)
+
+    if new > prev {
+        total += 1
+    }
+    prev = new
+}
+print("b:", total)