2024 Day 1 Complete!

2024/day01/main.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"fmt"
+	"slices"
+	"strconv"
+	"strings"
+
+	helpers "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := helpers.StdinToStringSlice()
+	part1(inp)
+	part2(inp)
+}
+
+func buildLists(inp []string) ([]int, []int) {
+	var list1, list2 []int
+	for i := range inp {
+		var pt string
+		for j := range inp[i] {
+			if inp[i][j] != ' ' {
+				pt = pt + string(inp[i][j])
+			} else if strings.TrimSpace(pt) != "" {
+				wrk, err := strconv.Atoi(pt)
+				if err != nil {
+					panic(err)
+				}
+				list1 = append(list1, wrk)
+				pt = ""
+			}
+		}
+		// End of line
+		wrk, err := strconv.Atoi(pt)
+		if err != nil {
+			panic(err)
+		}
+		list2 = append(list2, wrk)
+		pt = ""
+	}
+	return list1, list2
+}
+
+func part1(inp []string) {
+	var diffs []int
+	list1, list2 := buildLists(inp)
+	slices.Sort(list1)
+	slices.Sort(list2)
+	for i := 0; i < len(list1); i++ {
+		diffs = append(diffs, (list1[i] - list2[i]))
+	}
+	var total int
+	for i := range diffs {
+		if diffs[i] < 0 {
+			total = total - diffs[i]
+		} else {
+			total = total + diffs[i]
+		}
+	}
+	fmt.Println("# Part 1")
+	fmt.Println("Total Distance:", total)
+}
+
+func part2(inp []string) {
+	var score int
+	occ := make(map[int]int)
+	list1, list2 := buildLists(inp)
+	for i := range list2 {
+		occ[list2[i]]++
+	}
+	for i := range list1 {
+		score = score + (list1[i] * occ[list1[i]])
+	}
+	fmt.Println("# Part 2")
+	fmt.Println("Similarity Score:", score)
+}

2024/day01/testinput

@@ -0,0 +1,6 @@
+3   4
+4   3
+2   5
+1   3
+3   9
+3   3