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module advent.of.code/8 | ||
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go 1.13 | ||
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require github.com/davecgh/go-spew v1.1.1 |
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github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= |
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package main | ||
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import ( | ||
"fmt" | ||
"io/ioutil" | ||
"log" | ||
"os" | ||
"strconv" | ||
"strings" | ||
) | ||
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const ( | ||
numberOfRows = 6 | ||
numberOfCols = 25 | ||
) | ||
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// Layer represents a 2D grid with pixels. | ||
type Layer [][]int | ||
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func main() { | ||
if len(os.Args) < 2 { | ||
log.Fatal("missing file as input") | ||
} | ||
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line, err := ioutil.ReadFile(os.Args[1]) | ||
if err != nil { | ||
log.Fatalf("could not read file: %s", err.Error()) | ||
} | ||
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var ( | ||
layers = createLayers(line) | ||
fewestZeros = 0 | ||
fewestZeroLayerIndex = 0 | ||
) | ||
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for i, layer := range layers { | ||
zero := findOccurancesInlayerOf(layer, 0) | ||
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if fewestZeros == 0 || zero < fewestZeros { | ||
fewestZeros = zero | ||
fewestZeroLayerIndex = i | ||
} | ||
} | ||
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ones := findOccurancesInlayerOf(layers[fewestZeroLayerIndex], 1) | ||
twos := findOccurancesInlayerOf(layers[fewestZeroLayerIndex], 2) | ||
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fmt.Println("part one: ", ones*twos) | ||
} | ||
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func createLayers(line []byte) []Layer { | ||
var ( | ||
layer = Layer{} | ||
layers = []Layer{} | ||
currentRow = []int{} | ||
) | ||
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for i, v := range strings.TrimSpace(string(line)) { | ||
intVal, _ := strconv.Atoi(string(v)) | ||
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currentRow = append(currentRow, intVal) | ||
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if (i+1)%numberOfCols == 0 { | ||
// Add the row to the current layer, reset the row. | ||
layer = append(layer, currentRow) | ||
currentRow = []int{} | ||
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if len(layer)%numberOfRows == 0 { | ||
// Add the current layer to the list of layers ever 6 rows. | ||
layers = append(layers, layer) | ||
layer = Layer{} | ||
} | ||
} | ||
} | ||
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return layers | ||
} | ||
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func findOccurancesInlayerOf(layer Layer, n int) int { | ||
var count = 0 | ||
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for _, row := range layer { | ||
for _, col := range row { | ||
if col == n { | ||
count++ | ||
} | ||
} | ||
} | ||
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return count | ||
} | ||
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func printLayer(layer Layer) { | ||
for _, row := range layer { | ||
fmt.Println(row) | ||
} | ||
} | ||
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/* | ||
createLayer := func() Layer { | ||
rows := make([][]int, numberOfRows) | ||
for i := range rows { | ||
cols := make([]int, numberOfCols) | ||
rows[i] = cols | ||
} | ||
return Layer(rows) | ||
} | ||
*/ |
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