chore: make language folders snake_case

2 files changed, 145 insertions, 0 deletions

diff --git a/2023/go/internal/day_01/day_01.go b/2023/go/internal/day_01/day_01.go
new file mode 100644
index 0000000..9cd0a49
--- /dev/null
+++ b/2023/go/internal/day_01/day_01.go
@@ -0,0 +1,114 @@
+package day_01
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func Solve() {
+	filename := "../_input/day_01.txt"
+	content := readFile(filename)
+
+	numbers := []int{}
+
+	lines := strings.Split(content, "\n")
+	for _, line := range lines {
+		first_num, last_num, err := findNumbers(line)
+		if err != nil {
+			continue
+		}
+
+		num_str := first_num + last_num
+		num := strToInt(num_str)
+		numbers = append(numbers, num)
+	}
+
+	acc := accumulate(numbers)
+
+	fmt.Println(acc)
+}
+
+func readFile(filename string) string {
+	content, err := os.ReadFile(filename)
+	if err != nil {
+		panic(err)
+	}
+
+	return string(content)
+}
+
+var num_map = map[string]string{
+	"zero":  "0",
+	"0":     "0",
+	"one":   "1",
+	"1":     "1",
+	"two":   "2",
+	"2":     "2",
+	"three": "3",
+	"3":     "3",
+	"four":  "4",
+	"4":     "4",
+	"five":  "5",
+	"5":     "5",
+	"six":   "6",
+	"6":     "6",
+	"seven": "7",
+	"7":     "7",
+	"eight": "8",
+	"8":     "8",
+	"nine":  "9",
+	"9":     "9",
+}
+
+func findNumbers(line string) (string, string, error) {
+	if line == "" || line == "\n" {
+		return "", "", errors.New("Empty line")
+	}
+
+	found_numbers := []string{}
+	window_size := 5
+	for i := range line {
+		window_end := i + window_size
+		if window_end > len(line) {
+			window_end = len(line)
+		}
+		sub_str := line[i:window_end]
+
+		for key, value := range num_map {
+			if strings.HasPrefix(sub_str, key) {
+				found_numbers = append(found_numbers, value)
+			}
+		}
+	}
+
+	if len(found_numbers) == 0 {
+		return "", "", errors.New("No numbers found")
+	}
+
+	first := found_numbers[0]
+	last := found_numbers[len(found_numbers)-1]
+
+	return first, last, nil
+}
+
+func accumulate(numbers []int) int {
+	acc := 0
+
+	for _, num := range numbers {
+		acc += num
+	}
+
+	return acc
+}
+
+func strToInt(str string) int {
+	num, err := strconv.ParseInt(str, 0, 0)
+	if err != nil {
+		panic(err)
+	}
+
+	return int(num)
+}
diff --git a/2023/go/internal/day_01/day_01_test.go b/2023/go/internal/day_01/day_01_test.go
new file mode 100644
index 0000000..8063619
--- /dev/null
+++ b/2023/go/internal/day_01/day_01_test.go
@@ -0,0 +1,31 @@
+package day_01
+
+import (
+	"testing"
+)
+
+type input string
+type answer string
+
+func TestFindNumbers(t *testing.T) {
+	data := map[input]answer{
+		"1abc2":       "12",
+		"pqr3stu8vwx": "38",
+		"a1b2c3d4e5f": "15",
+		"treb7uchet":  "77",
+	}
+
+	for input, expected := range data {
+		actual_first, actual_last, err := findNumbers(string(input))
+
+		if err != nil {
+			t.Error("find_numbers returned an error")
+		}
+
+		actual := actual_first + actual_last
+
+		if actual != string(expected) {
+			t.Errorf("Expected %s, got %s", expected, actual)
+		}
+	}
+}