From 9833eeb598f420a814d0226a7d600a4f59b666f5 Mon Sep 17 00:00:00 2001
From: Steven Le Rouzic <steven.lerouzic@gmail.com>
Date: Sun, 1 Dec 2024 17:59:49 +0100
Subject: Day 1
---
day1/data.txt | 1000 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
day1/example.txt | 6 +
day1/go.mod | 3 +
day1/main.go | 89 +++++
4 files changed, 1098 insertions(+)
create mode 100644 day1/data.txt
create mode 100644 day1/example.txt
create mode 100644 day1/go.mod
create mode 100644 day1/main.go
(limited to 'day1')
diff --git a/day1/data.txt b/day1/data.txt
new file mode 100644
index 0000000..2ee941e
--- /dev/null
+++ b/day1/data.txt
@@ -0,0 +1,1000 @@
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diff --git a/day1/example.txt b/day1/example.txt
new file mode 100644
index 0000000..c88ca55
--- /dev/null
+++ b/day1/example.txt
@@ -0,0 +1,6 @@
+3 4
+4 3
+2 5
+1 3
+3 9
+3 3
diff --git a/day1/go.mod b/day1/go.mod
new file mode 100644
index 0000000..295de4c
--- /dev/null
+++ b/day1/go.mod
@@ -0,0 +1,3 @@
+module stevenlr.com/aoc2024/day1
+
+go 1.22.2
diff --git a/day1/main.go b/day1/main.go
new file mode 100644
index 0000000..03f738f
--- /dev/null
+++ b/day1/main.go
@@ -0,0 +1,89 @@
+package main
+
+import (
+ "bufio"
+ "fmt"
+ "os"
+ "sort"
+ "strconv"
+ "strings"
+)
+
+func IntAbs(a int) int {
+ if a >= 0 {
+ return a
+ }
+ return -a
+}
+
+func main() {
+ part2(readData("data.txt"))
+}
+
+func readData(fileName string) (list1, list2 []int) {
+ fp, err := os.Open(fileName)
+ if err != nil {
+ panic(err)
+ }
+
+ scanner := bufio.NewScanner(fp)
+
+ list1 = make([]int, 0)
+ list2 = make([]int, 0)
+
+ for scanner.Scan() {
+ line := strings.TrimSpace(scanner.Text())
+ split := strings.Split(line, " ")
+ if len(split) != 2 {
+ continue
+ }
+
+ value1, err := strconv.Atoi(split[0])
+ if err != nil {
+ continue
+ }
+
+ value2, err := strconv.Atoi(split[1])
+ if err != nil {
+ continue
+ }
+
+ list1 = append(list1, value1)
+ list2 = append(list2, value2)
+ }
+
+ return
+}
+
+func part1(list1, list2 []int) {
+ sort.Sort(sort.IntSlice(list1))
+ sort.Sort(sort.IntSlice(list2))
+
+ dist := 0
+ for i := range list1 {
+ dist += IntAbs(list1[i] - list2[i])
+ }
+
+ fmt.Println(dist)
+}
+
+func countInstances(list []int) (counts map[int]int) {
+ counts = make(map[int]int)
+ for _, n := range list {
+ counts[n] += 1
+ }
+ return
+}
+
+func part2(list1, list2 []int) {
+ counts1 := countInstances(list1)
+ counts2 := countInstances(list2)
+
+ total := 0
+ for n, c1 := range counts1 {
+ c2, _ := counts2[n]
+ total += n * c1 * c2
+ }
+
+ fmt.Println(total)
+}
--
cgit