✨ Finish part 1 & 2 of day 3

2019-12-04 17:20:16 +01:00 · 2019-12-04 17:20:16 +01:00 · 7d66e8b910
commit 7d66e8b910
parent 4f48f24c74
3 changed files with 239 additions and 0 deletions
--- a/day3/input.txt
+++ b/day3/input.txt
@ -0,0 +1,2 @@
+R998,U494,L814,D519,R407,U983,R307,D745,R64,D29,L935,D919,L272,D473,R689,U560,L942,U264,R816,U745,R209,U227,R241,U111,L653,D108,R823,U254,L263,U987,L368,D76,R665,D646,L759,U425,L581,D826,R829,D388,L234,U33,L48,U598,L708,D764,L414,D75,L163,U802,L183,U893,L486,U947,L393,D694,L454,D600,R377,U312,R89,D178,L652,D751,R402,D946,R213,U985,R994,D336,R573,D105,L442,U965,R603,U508,L17,U191,L37,U678,L506,U823,R878,D709,L348,U167,L355,U314,L164,D672,L309,U895,R358,D769,R869,U598,R63,D68,R105,U133,R357,U588,L154,D631,L939,D235,R506,D885,R958,D896,L195,U292,L952,D616,L824,D497,R99,D121,R387,D155,L70,U580,L890,D368,L910,U645,L786,U977,R9,U781,L454,U783,L382,U321,L195,U196,L239,U764,R18,D71,R97,U77,L803,U963,L704,U94,L511,U747,L798,D905,L679,D135,R455,U650,R947,U14,L722,D245,L490,D183,L276,U559,L901,D767,R827,U522,L380,U494,R402,U70,R589,D582,R206,U756,L989,U427,L704,D864,R885,D9,R872,U454,R912,U752,R197,U304,L728,U879,R456,D410,L141,U473,R246,U498,R443,D297,R333,D123,R12,D665,R684,D531,R601,D13,L260,U60,R302,D514,R416,D496,L562,D334,L608,U74,R451,U251,R961,U166,L368,U146,R962,U973,R120,U808,R480,D536,L690,D958,R292,U333,R656,U305,R46,U831,L756,D907,L638,D969,L445,U541,R784,U148,R338,D264,R72,D637,R759,D709,L611,D34,R99,U305,R143,D191,R673,D753,R387,U994,R720,D896,R95,U703,L499,D453,R96,U808,L485,U127,L856,U357,L543,U382,R411,U969,L532,U64,R303,U457,L412,D140,R146,D67,R147,D681,L1,D994,L876,D504,R46,U683,L992,U640,L663,D681,L327,U840,R543,U97,R988,U792,R36
+L999,U148,L592,D613,L147,D782,R594,U86,R891,D448,R92,U756,R93,D763,L536,U906,L960,D988,L532,U66,R597,U120,L273,D32,R525,U628,L630,U89,L248,U594,R886,D544,L288,U380,L23,D191,L842,U394,L818,U593,L195,U183,L863,D456,L891,D653,R618,U314,L775,D220,R952,U960,R714,U946,L343,D873,L449,U840,R769,U356,L20,D610,L506,U733,R524,D450,L888,D634,R737,U171,R906,U369,L172,D625,L97,D437,R359,D636,R775,U749,L281,U188,R418,D437,R708,D316,L388,D717,R59,U73,R304,U148,L823,U137,R265,U59,R488,D564,R980,U798,L626,U47,L763,U858,L450,U663,R378,U93,L275,U472,L792,U544,R192,D979,L520,U835,L946,D615,L120,U923,L23,U292,R396,U605,L76,U813,L388,U500,L848,U509,L276,D538,R26,D806,R685,D319,R414,D989,L519,U603,R898,D477,L107,D828,R836,U432,L601,U888,L476,D974,L911,U122,L921,D401,L878,D962,L214,D913,L113,U418,R992,U844,L928,U534,L13,U457,L866,D208,L303,D732,L497,U673,R659,D639,R430,D301,L573,U373,L270,D901,L605,D935,R440,D183,R374,D883,L551,U771,R707,D141,R984,U346,R894,U1,R33,U492,R371,D631,R95,D62,L378,D343,R108,D611,L267,D871,L296,U391,R302,D424,R160,U141,R682,U949,R380,U251,L277,D404,R392,D210,L158,U896,R350,D891,L837,D980,R288,U597,L292,D639,L943,D827,L492,D625,L153,D570,R948,D855,L945,U840,L493,U800,L392,D438,R8,U966,R218,U597,R852,D291,L840,D831,L498,U846,R875,D244,R159,U243,R975,D246,R549,D304,R954,D123,R58,U5,L621,U767,R455,U550,R800,D417,R869,D184,L966,D51,L383,U132,L664,U220,L263,D307,R716,U346,L958,U84,L154,U90,L726,U628,L159,U791,L643,D652,L138,U577,R457,U655,L547,D441,L21
--- a/day3/main.go
+++ b/day3/main.go
@ -0,0 +1,156 @@
+package main
+
+import (
+	"bufio"
+	"log"
+	"math"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type Point struct {
+	X int
+	Y int
+}
+
+func main() {
+	file, err := os.Open("input.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	if !scanner.Scan() {
+		log.Fatalln("Problem while read line.")
+		return
+	}
+	route1 := scanner.Text()
+	if !scanner.Scan() {
+		log.Fatalln("Problem while read second line.")
+		return
+	}
+	route2 := scanner.Text()
+	distance := GetShortestDistance(route1, route2)
+	routeDistance := GetShortestRoute(route1, route2)
+
+	log.Println("Part1: Distance: " + strconv.Itoa(distance))
+	log.Println("Part2: Route: " + strconv.Itoa(routeDistance))
+
+}
+
+func GetShortestDistance(route1 string, route2 string) int {
+	points1 := GetAllPointsFromRoute(ParseRoute(route1))
+	points2 := GetAllPointsFromRoute(ParseRoute(route2))
+	crossed := FindAllCrossedPoints(points1, points2)
+	distance := GetShortestDistanceFromPoints(crossed)
+	return distance
+}
+
+func GetShortestRoute(route1 string, route2 string) int {
+	points1 := GetAllPointsFromRoute(ParseRoute(route1))
+	points2 := GetAllPointsFromRoute(ParseRoute(route2))
+	crossed := FindAllCrossedPoints(points1, points2)
+
+	shortestDis := math.MaxInt32
+	for _, point := range crossed {
+		distance1 := GetRouteDistanceToPoint(points1, point)
+		distance2 := GetRouteDistanceToPoint(points2, point)
+		fullDistance := distance1 + distance2
+		if fullDistance < shortestDis {
+			shortestDis = fullDistance
+		}
+	}
+	return shortestDis
+}
+
+func ParseRoute(route string) []string {
+	return strings.Split(route, ",")
+}
+
+func GetAllPointsFromRoute(cmds []string) []Point {
+	var (
+		currentX int
+		currentY int
+		points   []Point
+	)
+
+	for _, cmd := range cmds {
+		runes := []rune(cmd)
+		direction := string(runes[0])
+		lengthStr := string(runes[1:len(runes)])
+		length, _ := strconv.Atoi(lengthStr)
+
+		if direction == "R" {
+			for i := 1; i <= length; i++ {
+				currentX++
+				points = append(points, Point{X: currentX, Y: currentY})
+			}
+		} else if direction == "L" {
+			for i := 1; i <= length; i++ {
+				currentX--
+				points = append(points, Point{X: currentX, Y: currentY})
+			}
+		} else if direction == "U" {
+			for i := 1; i <= length; i++ {
+				currentY++
+				points = append(points, Point{X: currentX, Y: currentY})
+			}
+		} else if direction == "D" {
+			for i := 1; i <= length; i++ {
+				currentY--
+				points = append(points, Point{X: currentX, Y: currentY})
+			}
+		} else {
+			log.Fatal("ERROR Cmd: " + direction)
+		}
+	}
+	return points
+}
+
+func FindAllCrossedPoints(a []Point, b []Point) []Point {
+	crossedPoints := make([]Point, 0)
+
+	for _, pointA := range a {
+		for _, pointB := range b {
+			if pointA.X == pointB.X && pointA.Y == pointB.Y {
+				crossedPoints = append(crossedPoints, pointA)
+			}
+		}
+	}
+	return crossedPoints
+}
+
+func GetShortestDistanceFromPoints(points []Point) int {
+	shortestDis := math.MaxInt32
+	for _, point := range points {
+		distance := GetDistanceFromPoint(point)
+		if distance < shortestDis {
+			shortestDis = distance
+		}
+	}
+	return shortestDis
+}
+
+func GetRouteDistanceToPoint(route []Point, point Point) int {
+	sum := 0
+	for _, routePoint := range route {
+		sum++
+		if routePoint.X == point.X && routePoint.Y == point.Y {
+			break
+		}
+	}
+	return sum
+}
+
+func GetDistanceFromPoint(point Point) int {
+	return GetPositiveNumber(point.X) + GetPositiveNumber(point.Y)
+}
+
+func GetPositiveNumber(num int) int {
+	if num < 0 {
+		return -1 * num
+	}
+	return num
+}
--- a/day3/main_test.go
+++ b/day3/main_test.go
@ -0,0 +1,81 @@
+package main
+
+import "testing"
+
+func TestGetPositiveNumber1(t *testing.T) {
+	num := GetPositiveNumber(4)
+	if num != 4 {
+		t.Errorf("Number was incorrect, got: {%d}, want: {%d}.", num, 4)
+	}
+}
+
+func TestGetPositiveNumber2(t *testing.T) {
+	num := GetPositiveNumber(-4)
+	if num != 4 {
+		t.Errorf("Number was incorrect, got: {%d}, want: {%d}.", num, 4)
+	}
+}
+
+func TestGetPositiveNumber3(t *testing.T) {
+	num := GetPositiveNumber(0)
+	if num != 0 {
+		t.Errorf("Number was incorrect, got: {%d}, want: {%d}.", num, 0)
+	}
+}
+
+func TestGetDistanceFromPoint1(t *testing.T) {
+	distance := GetDistanceFromPoint(Point{3, 3})
+	if distance != 6 {
+		t.Errorf("Error was incorrect, got: {%d}, want: {%d}.", distance, 6)
+
+	}
+}
+
+func TestGetDistanceFromPoint2(t *testing.T) {
+	distance := GetDistanceFromPoint(Point{3, -3})
+	if distance != 6 {
+		t.Errorf("Distance was incorrect, got: {%d}, want: {%d}.", distance, 6)
+	}
+}
+
+func TestExample1(t *testing.T) {
+	route1 := "R75,D30,R83,U83,L12,D49,R71,U7,L72"
+	route2 := "U62,R66,U55,R34,D71,R55,D58,R83"
+	points1 := GetAllPointsFromRoute(ParseRoute(route1))
+	points2 := GetAllPointsFromRoute(ParseRoute(route2))
+	crossed := FindAllCrossedPoints(points1, points2)
+	distance := GetShortestDistanceFromPoints(crossed)
+	if distance != 159 {
+		t.Errorf("Route Distance was incorrect, got: {%d}, want: {%d}.", distance, 159)
+	}
+}
+
+func TestExample2(t *testing.T) {
+	route1 := "R98,U47,R26,D63,R33,U87,L62,D20,R33,U53,R51"
+	route2 := "U98,R91,D20,R16,D67,R40,U7,R15,U6,R7"
+	points1 := GetAllPointsFromRoute(ParseRoute(route1))
+	points2 := GetAllPointsFromRoute(ParseRoute(route2))
+	crossed := FindAllCrossedPoints(points1, points2)
+	distance := GetShortestDistanceFromPoints(crossed)
+	if distance != 135 {
+		t.Errorf("Route Distance was incorrect, got: {%d}, want: {%d}.", distance, 135)
+	}
+}
+
+func TestShortesRoute1(t *testing.T) {
+	route1 := "R75,D30,R83,U83,L12,D49,R71,U7,L72"
+	route2 := "U62,R66,U55,R34,D71,R55,D58,R83"
+	distance := GetShortestRoute(route1, route2)
+	if distance != 610 {
+		t.Errorf("Route Distance was incorrect, got: {%d}, want: {%d}.", distance, 610)
+	}
+}
+
+func TestShortesRoute2(t *testing.T) {
+	route1 := "R98,U47,R26,D63,R33,U87,L62,D20,R33,U53,R51"
+	route2 := "U98,R91,D20,R16,D67,R40,U7,R15,U6,R7"
+	distance := GetShortestRoute(route1, route2)
+	if distance != 410 {
+		t.Errorf("Route Distance was incorrect, got: {%d}, want: {%d}.", distance, 410)
+	}
+}