AOC2022/day15/day15.go

package main

import (
	"AOC2022/helper"
	"fmt"
	"strconv"
	"strings"
)

func main() {
	//args := os.Args[1:]
	lines := helper.ReadTextFile("day15/input")
	points := getPoints(lines)
	//scannedXPoints := make(map[int]bool)
	scannedPoints := getScannedPointsForTagetY(points, [2]int{0, 4000000}, [2]int{0, 4000000})
	//fmt.Println(scannedPoints)
	fmt.Println(len(scannedPoints))
	for i := 0; i <= 4000000; i++ {
		for j := 0; j <= 20; j++ {
			if !scannedPoints[[2]int{i, j}] {
				fmt.Println([2]int{i, j})
			}
		}
	}
}

func getScannedPointsForTagetY(points [][2][2]int, targetyRange [2]int, targetxRange [2]int) map[[2]int]bool {
	scannedYPoints := make(map[[2]int]bool)
	for rotation, pointPair := range points {
		sensor := pointPair[0]
		beacon := pointPair[1]
		distanceToSensor := helper.ManHattanDistance(sensor, beacon)
		distanceToTargetYLowest := helper.Abs(sensor[1] - targetyRange[0])
		distanceToTargetYHighest := helper.Abs(sensor[1] - targetyRange[1])
		if sensor[1] >= targetyRange[1] && distanceToSensor >= distanceToTargetYHighest {
			i := targetyRange[1]
			for i >= targetyRange[1]-(distanceToSensor-distanceToTargetYHighest) && i >= targetyRange[0] {
				setPointsForTargetY(distanceToSensor, i, targetxRange, sensor, &scannedYPoints)
				i--
			}
		}
		if sensor[1] <= targetyRange[0] && distanceToSensor >= distanceToTargetYLowest {
			i := targetyRange[0]
			for i <= targetyRange[0]+(distanceToSensor-distanceToTargetYLowest) && i <= targetyRange[1] {
				setPointsForTargetY(distanceToSensor, i, targetxRange, sensor, &scannedYPoints)
				i++
			}
		}
		if sensor[1] >= targetyRange[0] && sensor[1] <= targetyRange[1] {
			i := sensor[1]
			for i <= targetyRange[1] && i <= sensor[1]+distanceToSensor {
				setPointsForTargetY(distanceToSensor, i, targetxRange, sensor, &scannedYPoints)
				i++
			}
			i = sensor[1]
			for i >= targetyRange[0] && i >= sensor[1]-distanceToSensor {
				setPointsForTargetY(distanceToSensor, i, targetxRange, sensor, &scannedYPoints)
				i--
			}
		}
		fmt.Println(rotation)
	}
	return scannedYPoints
}

func setPointsForTargetY(distanceToSensor, targetY int, targetxRange, sensor [2]int, scannedYPoints *map[[2]int]bool) {
	distanceToTargetY := helper.Abs(sensor[1] - targetY)
	widthOnTargetY := helper.Abs(distanceToTargetY - distanceToSensor)
	i := sensor[0] - widthOnTargetY
	if i < targetxRange[0] {
		i = targetxRange[0]
	}
	for i <= sensor[0]+widthOnTargetY && i <= targetxRange[1] {
		(*scannedYPoints)[[2]int{i, targetY}] = true
		i++
	}
}

func getPoints(lines []string) [][2][2]int {
	points := make([][2][2]int, len(lines))
	for i, line := range lines {
		intPair := [2][2]int{}
		stringParts := strings.Split(line[12:], ":")
		sensorStringNumbers := stringSliceToIntSlice(strings.Split(stringParts[0], ", y="))
		beaconStringNumbers := stringSliceToIntSlice(strings.Split(strings.ReplaceAll(stringParts[1], " closest beacon is at x=", ""), ", y="))
		intPair[0] = [2]int{sensorStringNumbers[0], sensorStringNumbers[1]}
		intPair[1] = [2]int{beaconStringNumbers[0], beaconStringNumbers[1]}
		points[i] = intPair
	}
	return points
}

func stringSliceToIntSlice(input []string) []int {
	intSlice := []int{}
	for _, str := range input {
		intSlice = append(intSlice, helper.RemoveError(strconv.Atoi(str)))
	}
	return intSlice
}