adding 2015 & 2025 advents

2015/03/golang/.vscode/settings.json

@@ -0,0 +1,10 @@
+{
+    "[go]": {
+        "editor.insertSpaces": false,
+        "editor.formatOnSave": true,
+        "editor.defaultFormatter": "golang.go",
+        "editor.codeActionsOnSave": {
+            "source.organizeImports": "explicit"
+        }
+    }
+}

2015/03/golang/go.mod

@@ -0,0 +1,3 @@
+module aoc/day-3
+
+go 1.24.4

2015/03/golang/main.go

@@ -0,0 +1,87 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+type Point struct {
+	x, y int
+}
+
+func main() {
+	input := readFile("../input.txt")
+	fmt.Println(input)
+	fmt.Println(part1(input))
+	fmt.Println(part2(input))
+}
+
+func part1(input string) int {
+	data := strings.Split(input, "")
+	locations := make(map[Point]int)
+	current := Point{x: 0, y: 0}
+	locations[current] = 1
+	for _, v := range data {
+		current = updateLocation(current, v)
+		l, exists := locations[current]
+		if exists {
+			locations[current] = l + 1
+		} else {
+			locations[current] = 1
+		}
+	}
+	return len(locations)
+}
+
+func part2(input string) int {
+	data := strings.Split(input, "")
+	locations := make(map[Point]int)
+	santa := Point{x: 0, y: 0}
+	robot := Point{x: 0, y: 0}
+	locations[santa] = 1
+	locations[robot] = 1
+	for i, v := range data {
+		if i%2 == 0 {
+			santa = updateLocation(santa, v)
+			l, exists := locations[santa]
+			if exists {
+				locations[santa] = l + 1
+			} else {
+				locations[santa] = 1
+			}
+		} else {
+			robot = updateLocation(robot, v)
+			l, exists := locations[robot]
+			if exists {
+				locations[robot] = l + 1
+			} else {
+				locations[robot] = 1
+			}
+		}
+	}
+	return len(locations)
+}
+
+func updateLocation(point Point, direction string) Point {
+	switch direction {
+	case "^":
+		return Point{point.x, point.y + 1}
+	case "v":
+		return Point{point.x, point.y - 1}
+	case ">":
+		return Point{point.x + 1, point.y}
+	case "<":
+		return Point{point.x - 1, point.y}
+	default:
+		return point
+	}
+}
+
+func readFile(filename string) string {
+	content, err := os.ReadFile(filename)
+	if err != nil {
+		return ""
+	}
+	return string(content)
+}