Day 1

.gitignore

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+# Hide inputs
+*.txt

d01/main.odin

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+package main
+
+import "core:fmt"
+import "core:math"
+import "core:os"
+import "core:strconv"
+import "core:strings"
+import "core:time"
+
+import util "../util"
+
+DIAL_START :: 50
+DIAL_MAX :: 100
+
+part_1 :: proc(lines: ^[]string) {
+	result := 0
+	dial := DIAL_START
+
+	for line in lines {
+		amount, ok := strconv.parse_int(line[1:]); assert(ok)
+
+		dir := line[0]
+		if dir == 'L' do amount = -amount
+
+		dial += amount
+		dial %%= DIAL_MAX
+		if dial == 0 do result += 1
+	}
+
+	fmt.printfln("  [Result] %v", result)
+}
+
+part_2 :: proc(lines: ^[]string) {
+	result := 0
+	dial := DIAL_START
+
+	for line in lines {
+		amount, ok := strconv.parse_int(line[1:]); assert(ok)
+		result += amount / DIAL_MAX
+
+		dir := line[0]
+		if dir == 'L' do amount = -amount
+
+		old_dial := dial
+		dial += amount
+		dial %%= DIAL_MAX
+
+		switch {
+		case dial == 0:
+			result += 1
+		case old_dial != 0:
+			wrapped := (dir == 'L' && old_dial < dial) || (dir == 'R' && old_dial > dial)
+			if wrapped do result += 1
+		}
+	}
+
+	fmt.printfln("  [Result] %v", result)
+}
+
+main :: proc() {
+	context.allocator = context.temp_allocator
+	defer free_all(context.temp_allocator)
+
+	INPUT :: #load("input.txt", string)
+	lines := strings.split(INPUT, "\n")
+	lines = lines[:len(lines) - 1]
+
+	fmt.println("[Part 1]")
+	start := time.tick_now()
+	part_1(&lines)
+	duration := time.tick_diff(start, time.tick_now())
+	fmt.printfln("  [Time]   %vns\n", time.duration_nanoseconds(duration))
+
+	fmt.printfln("[Part 2]")
+	start = time.tick_now()
+	part_2(&lines)
+	duration = time.tick_diff(start, time.tick_now())
+	fmt.printfln("  [Time]   %vns", time.duration_nanoseconds(duration))
+}

util/util.odin

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+package util
+