day 11 p1

day11p1/solution.go

@@ -0,0 +1,44 @@
+package day11p1
+
+import (
+	"io"
+	"strconv"
+	"strings"
+
+	"aoc/utils"
+)
+
+func Solve(r io.Reader) any {
+	lines := utils.ReadLines(r)
+
+	arrStr := strings.Split(lines[0], " ")
+	arr := make([]int, len(arrStr))
+	for i, s := range arrStr {
+		arr[i], _ = strconv.Atoi(s)
+	}
+
+	for i := 0; i < 25; i++ {
+		arr = blink(arr)
+	}
+
+	return len(arr)
+}
+
+func blink(arr []int) []int {
+    var result []int
+    for _, stone := range arr {
+        stonestr := strconv.Itoa(stone)
+        if stone == 0 {
+            result = append(result, 1)
+        } else if len(stonestr)%2 == 0 {
+            part1 := stonestr[:len(stonestr)/2]
+            part2 := stonestr[len(stonestr)/2:]
+            part1int, _ := strconv.Atoi(part1)
+            part2int, _ := strconv.Atoi(part2)
+            result = append(result, part1int, part2int)
+        } else {
+            result = append(result, stone*2024)
+        }
+    }
+    return result
+}

day11p1/solution_test.go

@@ -0,0 +1,33 @@
+package day11p1
+
+import (
+	"strings"
+	"testing"
+
+	"aoc/utils"
+)
+
+var testInput = `125 17`
+
+func TestSolve(t *testing.T) {
+	tests := []struct {
+		input  string
+		answer int
+	}{
+		{testInput, 55312},
+	}
+
+	if testing.Verbose() {
+		utils.Verbose = true
+	}
+
+	for _, test := range tests {
+		r := strings.NewReader(test.input)
+
+		result := Solve(r).(int)
+
+		if result != test.answer {
+			t.Errorf("Expected %d, got %d", test.answer, result)
+		}
+	}
+}