2024.11 Part 1

Author: jerodev

2024/11-pebbles/example.txt

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+125 17

2024/11-pebbles/input.txt

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+5910927 0 1 47 261223 94788 545 7771

2024/11-pebbles/main.go

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+package main
+
+import (
+	"advent-of-code/util"
+	"fmt"
+	"math"
+)
+
+func main() {
+	stones := util.StringToInts(util.ReadFileFromArgs(), " ")
+
+	for i := 0; i < 25; i++ {
+		stones = blink(stones)
+		fmt.Println(len(stones))
+	}
+
+	fmt.Println(len(stones))
+}
+
+func blink(stones []int) []int {
+	result := make([]int, 0, len(stones))
+	var l, left, mod int
+
+	for i := range stones {
+		if stones[i] == 0 {
+			result = append(result, 1)
+		} else if l = util.IntLength(stones[i]); l%2 == 0 {
+			mod = int(math.Pow(10, float64(l/2)))
+			left = int(stones[i] / mod)
+			result = append(result, left)
+			result = append(result, stones[i]-left*mod)
+		} else {
+			result = append(result, stones[i]*2024)
+		}
+	}
+
+	return result
+}