day1

.gitignore

@@ -0,0 +1 @@
+*.bin

day1/day1.odin

@@ -0,0 +1,63 @@
+package main
+
+import "core:fmt"
+import "core:os"
+import "core:slice"
+import "core:strconv"
+import "core:strings"
+
+import "../utils"
+
+main :: proc() {
+	input, err := utils.load_file("day1/input.txt")
+	if err != nil {
+		fmt.println("error loading input file: ", err)
+		return
+	}
+
+	n1, n2 := process_input(input)
+
+	distance := calc_distance(n1, n2)
+	similarity := calc_similarity(n1, n2)
+
+	fmt.println("Distance: ", distance)
+	fmt.println("Similarity: ", similarity)
+}
+
+calc_distance :: proc(n1: []int, n2: []int) -> int {
+	diff := 0
+
+	for i in 0 ..< len(n1) {
+		diff += abs(n1[i] - n2[i])
+	}
+
+	return diff
+}
+
+calc_similarity :: proc(n1: []int, n2: []int) -> int {
+	similarity := 0
+
+	for i in 0 ..< len(n1) {
+		n := n1[i]
+		similarity += n * slice.count(n2, n)
+	}
+
+	return similarity
+}
+
+process_input :: proc(input: []string) -> ([]int, []int) {
+	first := make([]int, len(input))
+	second := make([]int, len(input))
+
+	for line, i in input {
+		split := strings.split(line, " ")
+
+		first[i] = strconv.atoi(split[0])
+		second[i] = strconv.atoi(split[len(split) - 1])
+	}
+
+	slice.sort(first)
+	slice.sort(second)
+
+	return first, second
+}

readme.md

@@ -0,0 +1,3 @@
+# Advent of code 2024
+
+Trying [odin](https://odin-lang.org/) this year.

utils/load_file.odin

@@ -0,0 +1,22 @@
+package utils
+
+import "core:fmt"
+import "core:os"
+import "core:strings"
+
+Error :: os.Error
+
+load_file :: proc(path: string) -> ([]string, Error) {
+	file, open_err := os.open(path)
+	if open_err != nil {
+		return nil, open_err
+	}
+	defer os.close(file)
+
+	content, read_err := os.read_entire_file_or_err(file)
+	if read_err != nil {
+		return nil, read_err
+	}
+
+	return strings.split(string(content), "\n"), nil
+}