Update print flags.

day08/main.go

@@ -62,9 +62,9 @@ func main() {
 			for x := 0; x < width; x++ {
 				switch image[y*width+x] {
 				case 0:
-					fmt.Print(" ")
+					fmt.Print(".")
 				case 1:
-					fmt.Print("█")
+					fmt.Print("#")
 				default:
 					fmt.Print("?")
 				}

day10/main.go

@@ -2,14 +2,19 @@ package main
 
 import (
 	"bufio"
+	"flag"
 	"fmt"
 	"math"
 	"os"
 	"sort"
 	"strconv"
 )
 
+var printFlag = flag.Bool("print", false, "print map as the 200th asteroid is destroyed")
+
 func main() {
+	flag.Parse()
+
 	lines := readLines("input.txt")
 
 	asteroids := make(map[Vector2]bool)
@@ -58,11 +63,32 @@ func main() {
 		}
 	}
 
+	target := vaporizationOrder[199]
+
 	{
 		fmt.Println("--- Part Two ---")
-		target := vaporizationOrder[199]
 		fmt.Println(target.x*100 + target.y)
 	}
+
+	if *printFlag {
+		for _, asteroid := range vaporizationOrder[200:] {
+			asteroids[asteroid] = true
+		}
+		for y, line := range lines {
+			for x := range line {
+				if x == bestLocation.x && y == bestLocation.y {
+					fmt.Print("X")
+				} else if x == target.x && y == target.y {
+					fmt.Print("O")
+				} else if asteroids[Vector2{x, y}] {
+					fmt.Print("#")
+				} else {
+					fmt.Print(".")
+				}
+			}
+			fmt.Println()
+		}
+	}
 }
 
 func findVisibleAsteroids(location Vector2, asteroids map[Vector2]bool) []Vector2 {

day11/main.go

@@ -34,9 +34,9 @@ func main() {
 		for y := min.y; y <= max.y; y++ {
 			for x := min.x; x <= max.x; x++ {
 				if grid[Vector2{x, y}] == 1 {
-					fmt.Print("█")
+					fmt.Print("#")
 				} else {
-					fmt.Print(" ")
+					fmt.Print(".")
 				}
 			}
 			fmt.Println()

day15/main.go

@@ -159,9 +159,9 @@ func main() {
 				} else if !ok {
 					fmt.Print("?")
 				} else if value == Path {
-					fmt.Print(" ")
+					fmt.Print(".")
 				} else {
-					fmt.Print("█")
+					fmt.Print("#")
 				}
 			}
 			fmt.Println()

day24/main.go

@@ -2,11 +2,18 @@ package main
 
 import (
 	"bufio"
+	"flag"
 	"fmt"
 	"os"
 )
 
+type Layer [5][5]bool
+
+var printFlag = flag.Bool("print", false, "print final state for part two")
+
 func main() {
+	flag.Parse()
+
 	lines := readLines("input.txt")
 
 	{
@@ -60,8 +67,6 @@ func main() {
 	{
 		fmt.Println("--- Part Two ---")
 
-		type Layer [5][5]bool
-
 		var layer Layer
 		for y, line := range lines {
 			for x, char := range line {
@@ -160,17 +165,48 @@ func main() {
 
 		bugs := 0
 		for _, layer := range state {
-			for y := 0; y < 5; y++ {
-				for x := 0; x < 5; x++ {
-					if layer[y][x] {
-						bugs++
+			bugs += count(layer)
+		}
+
+		fmt.Println(bugs)
+
+		if *printFlag {
+			for count(state[min]) == 0 && min < max {
+				min++
+			}
+			for count(state[max]) == 0 && min < max {
+				max--
+			}
+			for index := min; index <= max; index++ {
+				layer := state[index]
+
+				fmt.Printf("Depth %d:\n", index)
+				for y := 0; y < 5; y++ {
+					for x := 0; x < 5; x++ {
+						if y == 2 && x == 2 {
+							fmt.Print("?")
+						} else if layer[y][x] {
+							fmt.Print("#")
+						} else {
+							fmt.Print(".")
+						}
 					}
+					fmt.Println()
 				}
 			}
 		}
+	}
+}
 
-		fmt.Println(bugs)
+func count(layer Layer) (bugs int) {
+	for y := 0; y < 5; y++ {
+		for x := 0; x < 5; x++ {
+			if layer[y][x] {
+				bugs++
+			}
+		}
 	}
+	return
 }
 
 func readLines(filename string) []string {