day08, solution not modified much

README.md

@@ -13,3 +13,4 @@ Day | Name | Type of Algo & Notes
 5 | Sunny with a Chance of Asteroids | - Yay more Intcode!........ <br> - This gave me fits... <br> - Good application for recursion (in my opinion)
 6 | Universal Orbit Map | - __Tree traversal__ and depth calculations. It's not quite a Graph, but it has a __directed graph__ algo feel too
 7 | Amplification Circuit | - More Intcode... Piping together multiple Intcode computers 😳😳😳 <br> - Refactored Intcode computer to an OOP approach so a single computer maintains its data <br> - Also requires making __permutations generator__ <br> - Some gymnastics to make this circular, but its easier with this OOP approach and the "objects"/instances of a struct maintaining their own data
+8 | Space Image Format | 3D Array manipulation

day08/part1/main.go

@@ -1,19 +1,15 @@
 package main
 
 import (
-	"bufio"
+	"adventofcode/util"
 	"fmt"
-	"log"
-	"os"
 	"strings"
 )
 
 func main() {
-	pixelString := readInputFile("./input.txt")
+	input := util.ReadFile("../input.txt")
-	// fmt.Println(pixelString)
 
-	charsSlice := strings.Split(pixelString, "")
+	charsSlice := strings.Split(input, "")
-	// fmt.Println(charsSlice)
 
 	layers := makeLayers(charsSlice)
 
@@ -25,24 +21,6 @@ func main() {
 	fmt.Println(ones * twos)
 }
 
-func readInputFile(path string) string {
-	var pixelString string
-
-	file, err := os.Open(path)
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer file.Close()
-
-	scanner := bufio.NewScanner(file)
-	for scanner.Scan() {
-		line := scanner.Text()
-		pixelString = line
-	}
-
-	return pixelString
-}
-
 func makeLayers(charsSlice []string) [][]string {
 	layers := make([][]string, 0)
 	// layers are 25x6 = 150 characters
@@ -50,7 +28,7 @@ func makeLayers(charsSlice []string) [][]string {
 	for i := 0; i*150 < len(charsSlice); i++ {
 		layers = append(layers, charsSlice[150*i:150*(i+1)])
 	}
-	// fmt.Println(layers)
+
 	return layers
 }
 
@@ -66,7 +44,6 @@ func getMinIndex(layers [][]string) int {
 		// update min and minIndex if countZeroes is less than the min value
 		if countZeroes < min {
 			min, minIndex = countZeroes, index
-			// fmt.Println(min, minIndex)
 		}
 	}
 
@@ -77,9 +54,10 @@ func countOnesAndTwos(layer []string) (int, int) {
 	ones, twos := 0, 0
 	// count ones and twos of the layer with the least zeroes
 	for _, pixel := range layer {
-		if pixel == "1" {
+		switch pixel {
+		case "1":
 			ones++
-		} else if pixel == "2" {
+		case "2":
 			twos++
 		}
 	}

day08/part2/main.go

@@ -1,24 +1,21 @@
 package main
 
 import (
-	"bufio"
+	"adventofcode/util"
 	"fmt"
-	"log"
-	"os"
 	"strings"
 )
 
 func main() {
-	pixelString := readInputFile("./input.txt")
+	// read the input file and put it into a slice for each character
-	// fmt.Println(pixelString)
+	pixelString := util.ReadFile("../input.txt")
-
 	charsSlice := strings.Split(pixelString, "")
-	// fmt.Println(charsSlice)
 
+	// make the characers into a 2D slice divided into layers
 	layers := makeLayers(charsSlice)
 
-	// fmt.Println(layers)
+	// for each pixel (all layers combined), iterate through all layers of the pixel
-
+	// iterate from the top layer until a 1 or 0 is found, set it to that value
 	final := make([]string, 0)
 	for i := 0; i < 150; i++ {
 		final = append(final, "2")
@@ -35,34 +32,10 @@ func main() {
 
 	finalString := strings.Join(final, "")
 
-	line1, line2, line3, line4, line5, line6 := finalString[0:25], finalString[25:50], finalString[50:75], finalString[75:100], finalString[100:125], finalString[125:150]
+	// Print the six lines (25 characters at a time) individually so the word is legible
-
+	for i := 0; i < 6; i++ {
-	// return the final image, flattened
+		fmt.Println(finalString[i*25 : (i+1)*25])
-	fmt.Println(line1)
-	fmt.Println(line2)
-	fmt.Println(line3)
-	fmt.Println(line4)
-	fmt.Println(line5)
-	fmt.Println(line6)
-}
-
-// helper functions
-func readInputFile(path string) string {
-	var pixelString string
-
-	file, err := os.Open(path)
-	if err != nil {
-		log.Fatal(err)
 	}
-	defer file.Close()
-
-	scanner := bufio.NewScanner(file)
-	for scanner.Scan() {
-		line := scanner.Text()
-		pixelString = line
-	}
-
-	return pixelString
 }
 
 func makeLayers(charsSlice []string) [][]string {