2024 day1

2024/go/day01/day01.go

@@ -0,0 +1,54 @@
+package day01
+
+import (
+	"adventofcode2024/utils"
+	"sort"
+	"strings"
+)
+
+func Part1(input string) int {
+	var list1, list2 []int
+
+	num := 0
+	lines := strings.Split(input, "\n")
+	for _, line := range lines {
+		fields := strings.Fields(line)
+		// Convert the fields to integers
+		val1 := utils.MustAtoi(fields[0])
+		val2 := utils.MustAtoi(fields[1])
+
+		// Append to the respective slices
+		list1 = append(list1, val1)
+		list2 = append(list2, val2)
+	}
+	sort.Ints(list1)
+	sort.Ints(list2)
+	for i := 0; i < len(list1); i++ {
+		num += utils.Abs(list1[i] - list2[i])
+	}
+	return num
+
+}
+
+func Part2(input string) int {
+	var list1 []int
+	list2 := make(map[int]int)
+
+
+	num := 0
+	lines := strings.Split(input, "\n")
+	for _, line := range lines {
+		fields := strings.Fields(line)
+		// Convert the fields to integers
+		val1 := utils.MustAtoi(fields[0])
+		val2 := utils.MustAtoi(fields[1])
+
+		// Append to the respective slices
+		list1 = append(list1, val1)
+		list2[val2]++
+	}
+	for i := 0; i < len(list1); i++ {
+		num += list1[i] * list2[list1[i]]
+	}
+	return num
+}