Big update: Adding all advent of codes to same repo

AdventOfCode2015/day3/day3.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"time"
+)
+
+type Coords struct {
+	x int
+	y int
+}
+
+func main() {
+
+	fmt.Println("Day 3")
+	start := time.Now()
+
+	dat, err := ioutil.ReadFile("day3.txt")
+	if err != nil {
+		panic(err)
+	}
+
+	position := Coords{x: 0, y: 0}
+	visited := make(map[Coords]int)
+	visited[position] = 1
+
+	for _, value := range dat {
+		solve(visited, &position, value)
+	}
+
+	elapsed := time.Since(start)
+	fmt.Printf("Part 1: %v %v \n", len(visited), elapsed)
+
+	start = time.Now()
+	position = Coords{x: 0, y: 0}
+	visited = make(map[Coords]int)
+	visited[position] = 1
+
+	for i := 0; i < len(dat); i = i + 2 {
+		solve(visited, &position, dat[i])
+	}
+
+	position.x = 0
+	position.y = 0
+
+	for i := 1; i < len(dat); i = i + 2 {
+		solve(visited, &position, dat[i])
+	}
+
+	fmt.Printf("Part 2: %v %v", len(visited), elapsed)
+
+}
+
+func solve(visited map[Coords]int, position *Coords, value byte) {
+	if value == []byte("<")[0] {
+		position.x--
+		visited[*position]++
+	} else if value == []byte(">")[0] {
+		position.x++
+		visited[*position]++
+	} else if value == []byte("^")[0] {
+		position.y++
+		visited[*position]++
+	} else if value == []byte("v")[0] {
+		position.y--
+		visited[*position]++
+	}
+}