fine, I'll put them on github

3/3.2.go

@@ -0,0 +1,72 @@
+package main
+
+import "os"
+import "fmt"
+import "math"
+import "strconv"
+
+// go run 3.2.go <input>
+
+// Need to brute force part two anyway, should have done that for part one...
+
+func main() {
+
+	target, _ := strconv.Atoi(os.Args[1])
+
+	// This is way overkill for the real solution, but needed it for testing initial grid size with value = i
+	squareSize := int(math.Ceil(math.Sqrt(float64(target)))) + 2
+	grid := make([][]int, squareSize)
+
+	for i := 0; i < squareSize; i++ {
+		y := make([]int, squareSize)
+		grid[i] = y
+	}
+
+	dirX := 1
+	dirY := 0
+	startVal := 1
+	posX := (squareSize - 1) / 2
+	posY := (squareSize - 1) / 2
+	grid[posX][posY] = 1
+
+	fmt.Println("sq", squareSize, "xy", posX, posY, "dir", dirX, dirY)
+
+	for i := startVal + 1; i <= target; i++ {
+
+		posX += dirX
+		posY += dirY
+
+		adj := grid[posX-1][posY-1] + grid[posX-1][posY] + grid[posX-1][posY+1] +
+			grid[posX][posY-1] + grid[posX][posY+1] +
+			grid[posX+1][posY-1] + grid[posX+1][posY] + grid[posX+1][posY+1]
+
+		//adj = i
+
+		grid[posX][posY] = adj
+		if adj > target {
+			fmt.Println("Result:", adj)
+			os.Exit(0)
+		}
+
+		if dirY == -1 && grid[posX+1][posY] == 0 {
+			dirY = 0
+			dirX = 1
+		}
+		if dirY == 1 && grid[posX-1][posY] == 0 {
+			dirY = 0
+			dirX = -1
+		}
+		if dirX == -1 && grid[posX][posY-1] == 0 {
+			dirY = -1
+			dirX = 0
+		}
+		if dirX == 1 && grid[posX][posY+1] == 0 {
+			dirY = 1
+			dirX = 0
+		}
+
+	}
+
+	//fmt.Println(grid)
+
+}