Initial commit

2023/day-1/part-1/main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"log"
+	"os"
+)
+
+func main() {
+	file, err := os.Open("2023/day-1/files/input")
+	if err != nil {
+		log.Fatalf("Error: %v", err)
+	}
+	defer file.Close()
+
+	fmt.Printf("Sum total: %d\n", calculateSumCalibrationValues(file))
+
+}
+
+func calculateSumCalibrationValues(r io.Reader) int {
+	scanner := bufio.NewScanner(r)
+
+	sum := 0
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		sum = sum + calibrationValue(line)
+	}
+	
+	return sum
+}
+
+func calibrationValue(line string) int {
+	var digits []int
+
+	for _, r := range []rune(line) {
+		if (r >= '0') && (r <= '9') {
+			digits = append(digits, int(r - '0'))
+		}
+	}
+
+	if len(digits) == 0 {
+		return 0
+	}
+
+	return (10*digits[0]) + digits[len(digits)-1]
+}

2023/day-1/part-1/main_test.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestCalculateSumCalibrationValues(t *testing.T) {
+	testStr := `
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet
+`
+
+	buf := bytes.NewBuffer([]byte(testStr))
+
+	want := 142
+	got := calculateSumCalibrationValues(buf)
+
+	if want != got {
+		t.Errorf("Unexpected value returned from calculateSumCalibrationValues(); want %d, got %d", want, got)
+	}
+}

2023/day-1/part-2/main.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strings"
+)
+
+const (
+	one   = "one"
+	two   = "two"
+	three = "three"
+	four  = "four"
+	five  = "five"
+	six   = "six"
+	seven = "seven"
+	eight = "eight"
+	nine  = "nine"
+)
+
+func main() {
+	file, err := os.Open("2023/day-1/files/input")
+	if err != nil {
+		log.Fatalf("ERROR: %v\n", err)
+	}
+	defer file.Close()
+
+	fmt.Printf("Sum total: %d\n", calculateSumCalibrationValues(file))
+}
+
+func calculateSumCalibrationValues(r io.Reader) int {
+	scanner := bufio.NewScanner(r)
+
+	var (
+		digits []int
+		sum    int
+	)
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		sum = sum + calibrationValue(line, digits)
+	}
+
+	return sum
+}
+
+func calibrationValue(line string, digits []int) int {
+	if len(line) > 0 {
+		switch {
+		case (line[0] >= '0') && (line[0] <= '9'):
+			digits = append(digits, int(line[0]-'0'))
+			return calibrationValue(line[1:], digits)
+		case strings.HasPrefix(line, one):
+			digits = append(digits, 1)
+			return calibrationValue(line[1:], digits)
+		case strings.HasPrefix(line, two):
+			digits = append(digits, 2)
+			return calibrationValue(line[1:], digits)
+		case strings.HasPrefix(line, three):
+			digits = append(digits, 3)
+			return calibrationValue(line[1:], digits)
+		case strings.HasPrefix(line, four):
+			digits = append(digits, 4)
+			return calibrationValue(line[1:], digits)
+		case strings.HasPrefix(line, five):
+			digits = append(digits, 5)
+			return calibrationValue(line[1:], digits)
+		case strings.HasPrefix(line, six):
+			digits = append(digits, 6)
+			return calibrationValue(line[1:], digits)
+		case strings.HasPrefix(line, seven):
+			digits = append(digits, 7)
+			return calibrationValue(line[1:], digits)
+		case strings.HasPrefix(line, eight):
+			digits = append(digits, 8)
+			return calibrationValue(line[1:], digits)
+		case strings.HasPrefix(line, nine):
+			digits = append(digits, 9)
+			return calibrationValue(line[1:], digits)
+		default:
+			return calibrationValue(line[1:], digits)
+		}
+	}
+
+	if len(digits) == 0 {
+		return 0
+	}
+
+	return (10*digits[0] + digits[len(digits)-1])
+}

2023/day-1/part-2/main_test.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestCalculateSumCalibrationValues(t *testing.T) {
+	testStr := `
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen
+`
+
+	buf := bytes.NewBuffer([]byte(testStr))
+
+	want := 281
+	got := calculateSumCalibrationValues(buf)
+
+	if want != got {
+		t.Errorf("Unexpected value returned from calculateSumCalibrationValues(); want %d, got %d", want, got)
+	}
+}

LICENSE

@@ -0,0 +1,20 @@
+MIT License
+
+Copyright (c) 2023 Dan Anglin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this
+software and associated documentation files (the “Software”), to deal in the Software
+without restriction, including without limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.asciidoc

@@ -0,0 +1,8 @@
+= Advent of Code
+
+My solutions to the https://adventofcode.com[Advent of Code] challenges.
+
+== Mirrors
+
+**Code Flow (Forgejo)**: https://codeflow.dananglin.me.uk/apollo/advent-of-code
+**GitHub**: https://github.com/dananglin/advent-of-code

go.mod

@@ -0,0 +1,3 @@
+module codeflow.dananglin.me.uk/apollo/advent-of-code
+
+go 1.21.4