Day 11. part 1.

day_11/data.txt

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+64554 35 906 6 6960985 5755 975820 0

day_11/example_data.txt

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+125 17

day_11/solution.go

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+package day_11
+
+import (
+	"strconv"
+	"strings"
+)
+
+// task:https://adventofcode.com/2024/day/11
+func SolveBasic(input string) int {
+	stones := load(input)
+
+	for i := 0; i < 25; i++ {
+		stones = blink(stones)
+	}
+
+	return len(stones)
+}
+
+// task:https://adventofcode.com/2024/day/10#part2
+func SolveComplex(input string) int {
+	return 0
+}
+
+func blink(before []uint64) []uint64 {
+	after := make([]uint64, 0, len(before))
+	for _, stone := range before {
+		if stone == 0 {
+			after = append(after, 1)
+		} else if val := fromUint(stone); len(val)%2 == 0 {
+			after = append(after, parseUint(val[:len(val)/2]))
+			after = append(after, parseUint(val[len(val)/2:]))
+		} else {
+			after = append(after, stone*2024)
+		}
+	}
+	return after
+}
+
+func fromUint(stone uint64) string {
+	return strconv.FormatUint(stone, 10)
+}
+
+func load(input string) []uint64 {
+	stones := []uint64{}
+	for _, substring := range strings.Split(input, " ") {
+		stones = append(stones, parseUint(substring))
+	}
+	return stones
+}
+
+func parseUint(substring string) uint64 {
+	if val, err := strconv.ParseUint(substring, 10, 64); err == nil {
+		return val
+	} else {
+		panic(err)
+	}
+}

day_11/solution_test.go

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+package day_11_test
+
+import (
+	"advent_of_code_2024/day_11"
+	_ "embed"
+	"testing"
+)
+
+//go:embed example_data.txt
+var ExampleData string
+
+func TestBasicSolutionExample(t *testing.T) {
+	result := day_11.SolveBasic(ExampleData)
+	if result != 55312 {
+		t.Fatalf("Expected 55312 received %d", result)
+	}
+}