Created
December 6, 2018 08:31
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package main | |
import ( | |
"bufio" | |
"flag" | |
"fmt" | |
"log" | |
"math" | |
"os" | |
) | |
type Input struct { | |
N int | |
X float64 | |
Y float64 | |
} | |
func readInput(filename string) []Input { | |
fileHandle, err := os.Open(filename) | |
if err != nil { | |
log.Fatal(err) | |
} | |
defer fileHandle.Close() | |
fileScanner := bufio.NewScanner(fileHandle) | |
inputList := []Input{} | |
n := 0 | |
for fileScanner.Scan() { | |
line := fileScanner.Text() | |
if len(line) > 0 { | |
i := Input{} | |
if _, err := fmt.Sscanf(line, "%b, %b", &i.X, &i.Y); err != nil { | |
log.Fatal(err) | |
} | |
i.N = n | |
n++ | |
inputList = append(inputList, i) | |
} | |
} | |
return inputList | |
} | |
var file = flag.String("file", "./input.txt", "file used for input") | |
func main() { | |
flag.Parse() | |
inputList := readInput(*file) | |
fmt.Println(part1(inputList)) | |
} | |
type coord struct { | |
X float64 | |
Y float64 | |
} | |
func part1(inputList []Input) (int, int) { | |
height := float64(0) | |
width := float64(0) | |
maxSum := float64(10000) | |
inf := make(map[coord]bool) | |
m := make(map[coord]int) | |
var coords []coord | |
regions := 0 | |
for _, input := range inputList { | |
if input.Y > height { | |
height = input.Y | |
} | |
if input.X > width { | |
width = input.X | |
} | |
coords = append(coords, coord{X: input.X, Y: input.Y}) | |
} | |
for y := float64(0); y < height; y++ { | |
for x := float64(0); x < width; x++ { | |
mc := coord{0, 0} | |
min := float64(-1) | |
tot := float64(0) | |
for _, c := range coords { | |
dist := math.Abs(x-c.X) + math.Abs(y-c.Y) | |
if dist < min || min == -1 { | |
min = dist | |
mc = c | |
} else if dist == min { | |
mc = coord{-1, -1} | |
} | |
// Part 2 | |
tot += math.Abs(x-c.X) + math.Abs(y-c.Y) | |
} | |
if x == 0 || y == 0 || x == width || y == height { | |
inf[mc] = true | |
} | |
m[mc]++ | |
// Part 2 | |
if tot < maxSum { | |
regions++ | |
} | |
} | |
} | |
max := 0 | |
for k, v := range m { | |
if _, found := inf[k]; v > max && !found { | |
max = v | |
} | |
} | |
return max, regions | |
} |
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