2023 D1P1

2023/01/01/demo-input.txt

@@ -0,0 +1,4 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet

2023/01/01/src/main.go

@@ -0,0 +1,98 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+const demo = false
+
+func readLines(path string) ([]string, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	var lines []string
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+	return lines, scanner.Err()
+}
+
+func isNumeric(s string) bool {
+	_, err := strconv.Atoi(s)
+	return err == nil
+}
+
+func calculateCoordinates(line string) int {
+	lineArray := strings.Split(line, "")
+	length := len(lineArray)
+
+	var first_num_found bool = false
+	var last_num_found bool = false
+	var first_num string
+	var last_num string
+
+	// Search forward
+	for i := 0; i < length; i++ {
+		char := string(lineArray[i])
+		if first_num_found == false {
+			if isNumeric(char) {
+				first_num = char
+				first_num_found = true
+			}
+		}
+	}
+
+	// Search backwards
+	for i := length - 1; i >= 0; i-- {
+		char := string(lineArray[i])
+		if last_num_found == false {
+			if isNumeric(char) {
+				last_num = char
+				last_num_found = true
+			}
+		}
+	}
+
+	number, _ := strconv.Atoi(first_num + last_num)
+
+	fmt.Sprint(first_num)
+	fmt.Sprint(last_num)
+	return number
+}
+
+func main() {
+	// Load file
+	var input_name string
+
+	if demo == true {
+		input_name = "demo-input.txt"
+	} else {
+		input_name = "input.txt"
+	}
+	path := "2023/01/01/" + input_name
+
+	lines, err := readLines(path)
+	if err != nil {
+		log.Fatalf("readLines: %s", err)
+	}
+
+	var calibrationValueSum int
+	// Read lines into Array
+	for i := 0; i < len(lines); i++ {
+		// chars := strings.Split(lines[i], "")
+		number := calculateCoordinates(lines[i])
+		calibrationValueSum += number
+		fmt.Printf("%d: %d\n", i+1, number)
+	}
+	fmt.Printf("Calibration Value: %d\n", calibrationValueSum)
+}