2017 Complete!

2017/day21/day21.go

@@ -6,11 +6,13 @@ import (
 	"math"
 	"os"
 	"strings"
+	"time"
 )
 
 var rules map[string]string
 
 func main() {
+	numIters := 18
 	rules = make(map[string]string)
 
 	inp := StdinToStrings()
@@ -19,27 +21,46 @@ func main() {
 		rules[pts[0]] = pts[2]
 		rules[Flip(pts[0])] = pts[2]
 		rules[Rotate(pts[0], 90)] = pts[2]
+		rules[Flip(Rotate(pts[0], 90))] = pts[2]
 		rules[Rotate(pts[0], 180)] = pts[2]
+		rules[Flip(Rotate(pts[0], 180))] = pts[2]
 		rules[Rotate(pts[0], 270)] = pts[2]
+		rules[Flip(Rotate(pts[0], 270))] = pts[2]
 	}
 
 	pattern := ".#./..#/###"
-	for i := 0; i < 2; i++ {
-		Tick(pattern)
+	PrettyPrint(pattern)
+	for i := 0; i < numIters; i++ {
+		ClearScreen()
+		PrettyPrint(pattern)
+		time.Sleep(time.Second / 2)
+		pattern = Tick(pattern)
+	}
+	fmt.Println("Bits On", strings.Count(pattern, "#"))
+}
+
+func PrettyPrint(inp string) {
+	for _, v := range strings.Split(inp, "/") {
+		fmt.Println(v)
 	}
-	/*
-		pattern = rules[pattern]
-		pts := SplitBlocks(pattern)
-		for i := range pts {
-			pts[i] = rules[pts[i]]
-		}
-		fmt.Println(pts)
-		fmt.Println(CombineBlocks(pts))
-	*/
 }
 
 func Tick(pt string) string {
-	fmt.Println(SplitBlocks(pt))
+	subPatterns := SplitBlocks(pt)
+	var tickSubs []string
+	for i := range subPatterns {
+		tickSubs = append(tickSubs, ApplyRule(subPatterns[i]))
+	}
+	return CombineBlocks(tickSubs)
+}
+
+func ApplyRule(inp string) string {
+	if v, ok := rules[inp]; ok {
+		return v
+	}
+	// This is an error.
+	fmt.Println("No rule for", inp)
+	os.Exit(1)
 	return ""
 }
 
@@ -55,23 +76,43 @@ func SplitBlocks(pt string) []string {
 		// 2x2 blocks
 		blkSize = 2
 	}
+
 	for j := 0; j < len(pts); j += blkSize {
 		for i := 0; i < len(pts[j]); i += blkSize {
-			ret = append(ret, pts[j][i:i+blkSize]+"/"+pts[j+1][i:i+blkSize])
+			if blkSize == 2 {
+				ret = append(ret, pts[j][i:i+blkSize]+"/"+pts[j+1][i:i+blkSize])
+			} else {
+				ret = append(ret, pts[j][i:i+blkSize]+"/"+pts[j+1][i:i+blkSize]+"/"+pts[j+2][i:i+blkSize])
+			}
 		}
 	}
 	return ret
 }
 
 func CombineBlocks(pts []string) string {
-	var ret string
-	sz := int(math.Sqrt(float64(len(pts))))
-	fmt.Println("Combining")
-	fmt.Println(sz)
-	//var j int
-	for i := 0; i < len(pts); i++ {
+	var ret []string
+	if len(pts) == 1 {
+		return pts[0]
 	}
-	return ret
+	var subPts [][]string
+	for i := range pts {
+		subPts = append(subPts, strings.Split(pts[i], "/"))
+	}
+	subPtSz := len(subPts[0])
+	ptSize := int(math.Sqrt(float64(len(subPts) * subPtSz * subPtSz)))
+	w, h := (ptSize / subPtSz), (ptSize / subPtSz)
+	for i := 0; i < h; i++ {
+		st := i * w
+		for j := 0; j < subPtSz; j++ {
+			var bld string
+			for k := 0; k < w; k++ {
+				bld += subPts[st+k][j]
+			}
+			ret = append(ret, bld)
+		}
+	}
+
+	return strings.Join(ret, "/")
 }
 
 func Flip(pt string) string {
@@ -115,6 +156,10 @@ func RevString(s string) string {
 	return string(runes)
 }
 
+func ClearScreen() {
+	fmt.Println("\033[H\033[2J")
+}
+
 func StdinToStrings() []string {
 	var input []string
 	scanner := bufio.NewScanner(os.Stdin)