added day 03

03/main.go

@@ -0,0 +1,76 @@
+package main
+
+import (
+	"fmt"
+	"math"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func countJoltage(i int, rows *[][]int) int {
+	totalJoltage := 0
+
+	for _, rowNumbers := range *rows {
+		index := 0
+		thisJoltage := 0
+
+		for digitPlace := range i {
+			index = int(math.Max(float64(index), float64(digitPlace)))
+
+			for candidate := index; candidate <= len(rowNumbers)-i+digitPlace; candidate++ {
+				if rowNumbers[candidate] > rowNumbers[index] {
+					index = candidate
+				}
+			}
+
+			thisJoltage += rowNumbers[index] * int(math.Pow10(i-digitPlace-1))
+
+			index++
+		}
+		totalJoltage += thisJoltage
+	}
+
+	return totalJoltage
+}
+
+func main() {
+	rows := strings.Split(loadData(false), "\n")
+
+	numbers := make([][]int, len(rows))
+
+	for ii, rowString := range rows {
+		row := strings.TrimSpace(rowString)
+
+		numbers[ii] = make([]int, len(row))
+
+		for numberIndex, cc := range row {
+			numbers[ii][numberIndex] = int(cc - '0')
+		}
+	}
+
+	fmt.Println(countJoltage(2, &numbers))
+	fmt.Println(countJoltage(12, &numbers))
+}
+
+func loadData(test bool) string {
+	fileName := "input"
+
+	if test {
+		fileName = "test"
+	}
+
+	if cont, err := os.ReadFile(fileName); err != nil {
+		panic(err)
+	} else {
+		return strings.TrimSpace(string(cont))
+	}
+}
+
+func parseInt(s string) int {
+	if ii, err := strconv.Atoi(s); err != nil {
+		panic(err)
+	} else {
+		return ii
+	}
+}