day 1

README.md

@@ -36,31 +36,3 @@ To run tests, use `swift test` for all tests, or e.g. `swift test --filter AoCTe
 | Day | Part 1 | Part 2 |
 | :---: | :---: | :---: |
 <!--- advent_readme_stars table --->
-
-### Time Log
-
-* Day1
-* Day2
-* Day3
-* Day4
-* Day5
-* Day6
-* Day7
-* Day8
-* Day9
-* Day10
-* Day11
-* Day12
-* Day13
-* Day14
-* Day15
-* Day16
-* Day17
-* Day18
-* Day19
-* Day20
-* Day21
-* Day22
-* Day23
-* Day24
-* Day25

Sources/Day01/Day01.swift

@@ -7,17 +7,57 @@
 import AoCTools
 
 final class Day01: AOCDay {
-
+    let lines: [String]
+
     init(input: String?) {
-        let input = input ?? Self.input
-        print(input)
+        lines = (input ?? Self.input).lines
     }
 
     func part1() -> Int {
-        return 0
+        lines.reduce(0) { acc, line in
+            let chars = line.map { $0 }
+            let first = chars.first { $0.isNumber }!
+            let last = chars.last { $0.isNumber }!
+            return acc + Int(String(first))! * 10 + Int(String(last))!
+        }
     }
 
     func part2() -> Int {
-        return 0
+        lines.reduce(0) { acc, line in
+            let first = firstNumber(in: line)
+            let last = lastNumber(in: line)
+            return acc + first * 10 + last
+        }
+    }
+
+    private let search = [
+        "one", "two", "three", "four", "five", "six", "seven", "eight", "nine",
+        "1", "2", "3", "4", "5", "6", "7", "8", "9"
+    ]
+
+    private func firstNumber(in line: String) -> Int {
+        var minIndex = Int.max
+        var value = 0
+        for (strIndex, str) in search.enumerated() {
+            if let index = line.indexOf(str), index < minIndex {
+                minIndex = index
+                value = strIndex + 1
+            }
+        }
+        if value > 9 { value -= 9 }
+        return value
+    }
+
+    private func lastNumber(in line: String) -> Int {
+        var maxIndex = Int.min
+        var value = 0
+        for (strIndex, str) in search.enumerated() {
+            if let index = line.indicesOf(str).last, index > maxIndex {
+                maxIndex = index
+                value = strIndex + 1
+            }
+        }
+        if value > 9 { value -= 9 }
+        return value
     }
 }

Tests/Day01Tests.swift

@@ -7,25 +7,39 @@ import XCTest
 
 final class Day01Tests: XCTestCase {
     let testInput = """
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet
+"""
+
+    let testInput2 = """
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen
 """
 
     func testDay01_part1() throws {
         let day = Day01(input: testInput) 
-        XCTAssertEqual(day.part1(), 0)
+        XCTAssertEqual(day.part1(), 142)
     }
 
     func testDay01_part1_solution() throws {
         let day = Day01(input: Day01.input) 
-        XCTAssertEqual(day.part1(), 0)
+        XCTAssertEqual(day.part1(), 53974)
     }
 
     func testDay01_part2() throws {
-        let day = Day01(input: testInput)
-        XCTAssertEqual(day.part2(), 0)
+        let day = Day01(input: testInput2)
+        XCTAssertEqual(day.part2(), 281)
     }
 
     func testDay01_part2_solution() throws {
         let day = Day01(input: Day01.input) 
-        XCTAssertEqual(day.part2(), 0)
+        XCTAssertEqual(day.part2(), 52840)
     }
 }