day2 part1

2025-12-12 13:57:53 -05:00
parent 0acb7c74db
commit ed6ae9333a
4 changed files with 339 additions and 0 deletions
--- a/day02/source/day02.swift
+++ b/day02/source/day02.swift
@@ -0,0 +1,85 @@
+#if !hasFeature(Embedded)
+import Foundation
+#endif
+
+@main
+struct Day02 {
+    #if hasFeature(Embedded)
+    static func main() {
+        gfxInitDefault()
+        consoleInit(GFX_TOP, nil)
+
+        run()
+
+        // Main loop
+        while aptMainLoop() {
+            hidScanInput()
+            let kDown = hidKeysDown()
+            if kDown & KEY_START != 0 {
+                break // break in order to return to hbmenu
+            }
+
+            gfxFlushBuffers()
+            gfxSwapBuffers()
+        }
+
+        gfxExit()
+    }
+
+    #else
+    static func main() {
+        run()
+    }
+    #endif
+
+    static func run() {
+        print("Parsing...")
+        let parsed = parseInput(realInput)
+        print("Running Part 1...")
+        part1(parsed)
+        //part2(parsed)
+        print("Finished!")
+    }
+
+    typealias ParsedInput = [(UInt64, UInt64)]
+
+    static func parseInput(_ input: String) -> ParsedInput {
+        input.split(separator: ",")
+            .filter({ line in
+                let split = line.split(separator: "-")
+                return String(split[0]).count % 2 == 0 || String(split[1]).count % 2 == 0
+            })
+            .map({ line in
+                let split = line.split(separator: "-")
+                return (UInt64(split.first!)!, UInt64(split.last!)!)
+            })
+    }
+
+    static func part1(_ input: ParsedInput) {
+        var sum: UInt64 = 0
+        for (lhs, rhs) in input {
+            for cur in lhs...rhs {
+                let cnt = String(cur).count
+                guard cnt % 2 == 0 else { continue }
+                let low = cur % UInt64(pow(10, (Double(cnt) / 2)))
+                let hi = low * UInt64(pow(10, (Double(cnt) / 2)))
+                if cur == hi + low {
+                    sum += cur
+                }
+            }
+        }
+        print("Part 1: \(sum)")
+    }
+
+    static func part2(_ input: ParsedInput) {
+
+    }
+}
+
+let testInput = """
+11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124
+"""
+
+let realInput = """
+492410748-492568208,246-390,49-90,16-33,142410-276301,54304-107961,12792-24543,3434259704-3434457648,848156-886303,152-223,1303-1870,8400386-8519049,89742532-89811632,535853-567216,6608885-6724046,1985013826-1985207678,585591-731454,1-13,12067202-12233567,6533-10235,6259999-6321337,908315-972306,831-1296,406-824,769293-785465,3862-5652,26439-45395,95-136,747698990-747770821,984992-1022864,34-47,360832-469125,277865-333851,2281-3344,2841977-2953689,29330524-29523460
+"""