2025 day01

Author: liamgallear

2025/day01/.bench

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+{"Lines":[{"Name":"Part 1","N":2691,"NsPerOp":457758,"AllocedBytesPerOp":0,"AllocsPerOp":0,"MBPerS":0,"Measured":1,"Ord":0},{"Name":"Part 2","N":6332,"NsPerOp":192958,"AllocedBytesPerOp":0,"AllocsPerOp":0,"MBPerS":0,"Measured":1,"Ord":0}],"Measured":1}

2025/day01/README.md

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+<!-- You can add some comments here if you want to :D -->

2025/day01/main.go

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+package main
+
+import (
+	"container/ring"
+	_ "embed"
+	"os"
+)
+
+//go:embed input.txt
+var input string
+
+//go:embed input_test.txt
+var inputTest string
+
+var r *ring.Ring
+
+func init() {
+	r = ring.New(100)
+	n := r.Len()
+	for i := 0; i < n; i++ {
+		r.Value = i
+		r = r.Next()
+	}
+}
+
+func main() {
+	// Check argv if we use test input or not
+	if len(os.Args) > 1 && os.Args[1] == "test" {
+		input = inputTest
+	}
+
+	answer := doPartOne(input)
+	println(answer)
+
+	answer = doPartTwo(input)
+	println(answer)
+}

2025/day01/main_test.go

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+package main
+
+import "testing"
+
+func BenchmarkPartOne(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		doPartOne(input)
+	}
+}
+
+func BenchmarkPartTwo(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		doPartTwo(input)
+	}
+}

2025/day01/part1.go

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+package main
+
+import (
+	"aocli/utils"
+	"strings"
+)
+
+func doPartOne(input string) int {
+	lines := strings.Split(strings.TrimSpace(input), "\n")
+	r = r.Move(50)
+	ans := 0
+	for _, line := range lines {
+		num := utils.Atoi(line[1:])
+		if line[0] == 'L' {
+			num = -num
+		}
+		r = r.Move(num)
+		if r.Value == 0 {
+			ans++
+		}
+	}
+	return ans
+}

2025/day01/part2.go

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+package main
+
+import (
+	"aocli/utils"
+	"strings"
+)
+
+func doPartTwo(input string) int {
+	lines := strings.Split(strings.TrimSpace(input), "\n")
+	r = r.Move(50)
+	ans := 0
+	for _, line := range lines {
+		num := utils.Atoi(line[1:])
+		for num > 100 {
+			num -= 100
+			ans++
+		}
+		if line[0] == 'L' {
+			if r.Value.(int) > 0 && r.Value.(int)-num < 0 {
+				ans++
+			}
+			r = r.Move(-num)
+			if r.Value == 0 {
+				ans++
+			}
+			continue
+		}
+		if r.Value.(int)+num > 100 {
+			ans++
+		}
+		r = r.Move(num)
+		if r.Value == 0 {
+			ans++
+		}
+	}
+	return ans
+}