2024-day13

Author: liamgallear

2024/day13/.bench

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+{"Lines":[{"Name":"Part 1","N":1888,"NsPerOp":573599,"AllocedBytesPerOp":0,"AllocsPerOp":0,"MBPerS":0,"Measured":1,"Ord":0},{"Name":"Part 2","N":2113,"NsPerOp":569922,"AllocedBytesPerOp":0,"AllocsPerOp":0,"MBPerS":0,"Measured":1,"Ord":0}],"Measured":1}

2024/day13/README.md

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

2024/day13/main.go

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+package main
+
+import (
+	"aocli/utils/reader"
+	_ "embed"
+	"fmt"
+	"image"
+	"os"
+)
+
+//go:embed input.txt
+var input string
+
+//go:embed input_test.txt
+var inputTest string
+
+type machine struct {
+	A, B, P image.Point
+}
+
+func main() {
+	// Check argv if we use test input or not
+	if len(os.Args) > 1 && os.Args[1] == "test" {
+		input = inputTest
+	}
+
+	answer := solve(input, 0)
+	println(answer)
+
+	answer = solve(input, 10000000000000)
+	println(answer)
+}
+
+func solve(input string, n int) int {
+	lines := reader.FileDoubleLine(input)
+	var machines []machine
+	for _, line := range lines {
+		var A, B, P image.Point
+		fmt.Sscanf(line, "Button A: X+%d, Y+%d\nButton B: X+%d, Y+%d\nPrize: X=%d, Y=%d\n", &A.X, &A.Y, &B.X, &B.Y, &P.X, &P.Y)
+		machines = append(machines, machine{A, B, P.Add(image.Point{n, n})})
+	}
+
+	var res int
+
+	for _, m := range machines {
+		res += calculate(m)
+	}
+	return res
+}
+
+func calculate(m machine) int {
+	aP := (m.B.Y*m.P.X - m.B.X*m.P.Y) / (m.A.X*m.B.Y - m.A.Y*m.B.X)
+	bP := (m.A.Y*m.P.X - m.A.X*m.P.Y) / (m.A.Y*m.B.X - m.A.X*m.B.Y)
+
+	if m.A.Mul(aP).Add(m.B.Mul(bP)) == m.P {
+		return aP*3 + bP
+	}
+	return 0
+}

2024/day13/main_test.go

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+package main
+
+import "testing"
+
+func BenchmarkPartOne(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		solve(input, 0)
+	}
+}
+
+func BenchmarkPartTwo(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		solve(input, 10000000000000)
+	}
+}