2023 Day 10 Complete!

2023/day10/input

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+----L7J7LFL77.L7-JJ|77FFJ-F7|FLJ7LF-L7|JL7L--F|F7FJ|LJL---7JLFLJJLL7F--JF7FJL7FJLJL-J7|7LF7F|JL-7|FFL-JJ7LL||L|FJ|FJJ|L7.7.F|7JJ-F--LJ.FFJLL
+L7L-7J-7F-7FL--JJ.LF.FFL-|L-|-JF7LLLJ|L--JJFFJLJLJ-|F-7F7FJ.L-7J|LLLL---J||7L||LL7F|J|LLJL|----L|||J7J-LJ.L||.|L7|||FFJFJ-|-7-----77L77|...|
+|F7JLJJF|--|||.J-7-J--7JFJ7.-7LJ77||-LFJ-7--||L|J7.|L7LJ||--J|F.|..|L|JF|LJ7L||-7LLJF7-L77L-J-77F|||7JFFFJ7LJ-L-JLJF-|F|F||..|-..F-7-||L----
+FJ||LLF-77.-|LF|-L.||LL.7JFL.F-L-7-L-.L.F-FJ.FFJJF-L-JJFJL7JFFL-|-L-7|.F7FJJ-LJ7L77.L-F-LL7JF--||LJJ--F-7L|JLLL-FJJF-|-F|-.-LL-77|.7.J-|..||
+FL--7.LLJ-JL7-FFJLF-J-|-F-7J-F.L|.|LJ---L-L7.-FJJL7JL..L--J-|L|.7--L|L-FJ|JJ-L.L-L-F-L|-LL7-JJ.LLFJ-|LLJLJ.JJLJ77J--.-.LL--JLJL|-LLJ7JL-J.-7

2023/day10/main.go

@@ -0,0 +1,168 @@
+package main
+
+import (
+	"fmt"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	m, l := part1(inp)
+	fmt.Println()
+	part2(m, l)
+}
+
+const (
+	NS = '|'
+	EW = '-'
+	NE = 'L'
+	NW = 'J'
+	SW = '7'
+	SE = 'F'
+
+	START = 'S'
+)
+
+var pipes = []byte{NS, EW, NE, NW, SW, SE}
+
+func part1(input []string) (h.CoordByteMap, []h.Coordinate) {
+	m := h.StringSliceToCoordByteMap(input)
+	_, loop := findLoop(&m)
+	fmt.Println("# Part 1")
+	fmt.Println(len(loop) / 2)
+	return m, loop
+}
+
+func part2(m h.CoordByteMap, loop []h.Coordinate) {
+	var insideCoords []h.Coordinate
+	var inside bool
+	var enclosed int
+	for y := m.TLY; y <= m.BRY; y++ {
+		inside = false
+		var rowPathStart byte
+		for x := m.TLX; x <= m.BRX; x++ {
+			wrk := h.Coordinate{X: x, Y: y}
+			wrkV := m.Get(wrk)
+			if h.CoordListContains(wrk, loop) { //&& (wrkV == NS || wrkV == NE || wrkV == NW) {
+				// This coordinate is part of the loop, so it can change the 'inside' flag
+				// A corner _only_ changes the flag if the 'exiting' corner continues in the same direction
+				// i.e.: L--J doesn't change the flag, L--7 does change the flag
+				switch wrkV {
+				case NE, SE:
+					rowPathStart = wrkV
+				case NW, SW:
+					if continues(rowPathStart, wrkV) {
+						inside = !inside
+					}
+				}
+				if wrkV == NS {
+					// a | always changes the flag
+					inside = !inside
+				}
+			} else {
+				if inside {
+					enclosed++
+					insideCoords = append(insideCoords, wrk)
+				}
+			}
+		}
+	}
+	fmt.Println("# Part 2")
+	fmt.Println(enclosed)
+	for _, insides := range insideCoords {
+		m.Put(insides, 'I')
+	}
+}
+
+// continues checks if two _corner_ pieces continue the flow in the same direction
+func continues(p1, p2 byte) bool {
+	switch p1 {
+	case NE:
+		return p2 == SW
+	case NW:
+		return p2 == SE
+	case SW:
+		return p2 == NE
+	case SE:
+		return p2 == NW
+	}
+	return false
+}
+
+func connectsNorth(v byte) bool {
+	return v == START || v == NS || v == NE || v == NW
+}
+func connectsSouth(v byte) bool {
+	return v == START || v == NS || v == SE || v == SW
+}
+func connectsEast(v byte) bool {
+	return v == START || v == EW || v == NE || v == SE
+}
+func connectsWest(v byte) bool {
+	return v == START || v == EW || v == NW || v == SW
+}
+
+func connects(m *h.CoordByteMap, p1, p2 h.Coordinate) bool {
+	p1v, p2v := m.Get(p1), m.Get(p2)
+	switch {
+	case p1.North().Equals(p2):
+		return connectsNorth(p1v) && connectsSouth(p2v)
+	case p1.East().Equals(p2):
+		return connectsEast(p1v) && connectsWest(p2v)
+	case p1.South().Equals(p2):
+		return connectsSouth(p1v) && connectsNorth(p2v)
+	case p1.West().Equals(p2):
+		return connectsWest(p1v) && connectsEast(p2v)
+	}
+	return false
+}
+
+func countConnections(m *h.CoordByteMap, p h.Coordinate) int {
+	var res int
+	for _, tst := range []h.Coordinate{p.North(), p.East(), p.South(), p.West()} {
+		if connects(m, p, tst) {
+			res++
+		}
+	}
+	return res
+}
+
+// Find loop finds all coordinates on the loop and returns:
+// 1. The starting coordinate
+// 2. All coordinates on the loop
+// It also replaces the 'S' for the starting coordinate with the appropriate
+// pipe byte
+func findLoop(m *h.CoordByteMap) (h.Coordinate, []h.Coordinate) {
+	start, _ := m.FindFirst(START)
+	next := start
+	path := []h.Coordinate{start}
+
+	// Figure out the starting pipe byte
+	for _, v := range pipes {
+		m.Put(start, v)
+		if countConnections(m, start) == 2 {
+			break
+		}
+	}
+
+	for {
+		for _, tst := range []h.Coordinate{
+			next.North(),
+			next.East(),
+			next.South(),
+			next.West(),
+		} {
+			if !connects(m, next, tst) || (!tst.Equals(start) && h.CoordListContains(tst, path)) {
+				continue
+			}
+			next = tst
+		}
+		if next.Equals(start) {
+			// We're done
+			return start, path
+		} else {
+			path = append(path, next)
+		}
+	}
+}

2023/day10/problem

@@ -0,0 +1,310 @@
+                               [1]Advent of Code
+
+     • [2][About]
+     • [3][Events]
+     • [4][Shop]
+     • [5][Settings]
+     • [6][Log Out]
+
+   br0xen [7](AoC++) 20*
+
+                                       //[8]2023
+
+     • [9][Calendar]
+     • [10][AoC++]
+     • [11][Sponsors]
+     • [12][Leaderboard]
+     • [13][Stats]
+
+   Our [14]sponsors help make Advent of Code possible:
+   [15]Kotlin by JetBrains - Jingle bells, Kotlin pals, coding all the way!
+   Solve puzzles, catch our daily livestreams for expert guidance, embrace
+   the joy of Kotlin, and engage with a fantastic community. Happy holidays
+   and happy coding!
+
+--- Day 10: Pipe Maze ---
+
+   You use the hang glider to ride the hot air from Desert Island all the way
+   up to the floating metal island. This island is surprisingly cold and
+   there definitely aren't any thermals to glide on, so you leave your hang
+   glider behind.
+
+   You wander around for a while, but you don't find any people or animals.
+   However, you do occasionally find signposts labeled "[16]Hot Springs"
+   pointing in a seemingly consistent direction; maybe you can find someone
+   at the hot springs and ask them where the desert-machine parts are made.
+
+   The landscape here is alien; even the flowers and trees are made of metal.
+   As you stop to admire some metal grass, you notice something metallic
+   scurry away in your peripheral vision and jump into a big pipe! It didn't
+   look like any animal you've ever seen; if you want a better look, you'll
+   need to get ahead of it.
+
+   Scanning the area, you discover that the entire field you're standing on
+   is densely packed with pipes; it was hard to tell at first because they're
+   the same metallic silver color as the "ground". You make a quick sketch of
+   all of the surface pipes you can see (your puzzle input).
+
+   The pipes are arranged in a two-dimensional grid of tiles:
+
+     • | is a vertical pipe connecting north and south.
+     • - is a horizontal pipe connecting east and west.
+     • L is a 90-degree bend connecting north and east.
+     • J is a 90-degree bend connecting north and west.
+     • 7 is a 90-degree bend connecting south and west.
+     • F is a 90-degree bend connecting south and east.
+     • . is ground; there is no pipe in this tile.
+     • S is the starting position of the animal; there is a pipe on this
+       tile, but your sketch doesn't show what shape the pipe has.
+
+   Based on the acoustics of the animal's scurrying, you're confident the
+   pipe that contains the animal is one large, continuous loop.
+
+   For example, here is a square loop of pipe:
+
+ .....
+ .F-7.
+ .|.|.
+ .L-J.
+ .....
+
+   If the animal had entered this loop in the northwest corner, the sketch
+   would instead look like this:
+
+ .....
+ .S-7.
+ .|.|.
+ .L-J.
+ .....
+
+   In the above diagram, the S tile is still a 90-degree F bend: you can tell
+   because of how the adjacent pipes connect to it.
+
+   Unfortunately, there are also many pipes that aren't connected to the
+   loop! This sketch shows the same loop as above:
+
+ -L|F7
+ 7S-7|
+ L|7||
+ -L-J|
+ L|-JF
+
+   In the above diagram, you can still figure out which pipes form the main
+   loop: they're the ones connected to S, pipes those pipes connect to, pipes
+   those pipes connect to, and so on. Every pipe in the main loop connects to
+   its two neighbors (including S, which will have exactly two pipes
+   connecting to it, and which is assumed to connect back to those two
+   pipes).
+
+   Here is a sketch that contains a slightly more complex main loop:
+
+ ..F7.
+ .FJ|.
+ SJ.L7
+ |F--J
+ LJ...
+
+   Here's the same example sketch with the extra, non-main-loop pipe tiles
+   also shown:
+
+ 7-F7-
+ .FJ|7
+ SJLL7
+ |F--J
+ LJ.LJ
+
+   If you want to get out ahead of the animal, you should find the tile in
+   the loop that is farthest from the starting position. Because the animal
+   is in the pipe, it doesn't make sense to measure this by direct distance.
+   Instead, you need to find the tile that would take the longest number of
+   steps along the loop to reach from the starting point - regardless of
+   which way around the loop the animal went.
+
+   In the first example with the square loop:
+
+ .....
+ .S-7.
+ .|.|.
+ .L-J.
+ .....
+
+   You can count the distance each tile in the loop is from the starting
+   point like this:
+
+ .....
+ .012.
+ .1.3.
+ .234.
+ .....
+
+   In this example, the farthest point from the start is 4 steps away.
+
+   Here's the more complex loop again:
+
+ ..F7.
+ .FJ|.
+ SJ.L7
+ |F--J
+ LJ...
+
+   Here are the distances for each tile on that loop:
+
+ ..45.
+ .236.
+ 01.78
+ 14567
+ 23...
+
+   Find the single giant loop starting at S. How many steps along the loop
+   does it take to get from the starting position to the point farthest from
+   the starting position?
+
+   Your puzzle answer was 6942.
+
+--- Part Two ---
+
+   You quickly reach the farthest point of the loop, but the animal never
+   emerges. Maybe its nest is within the area enclosed by the loop?
+
+   To determine whether it's even worth taking the time to search for such a
+   nest, you should calculate how many tiles are contained within the loop.
+   For example:
+
+ ...........
+ .S-------7.
+ .|F-----7|.
+ .||.....||.
+ .||.....||.
+ .|L-7.F-J|.
+ .|..|.|..|.
+ .L--J.L--J.
+ ...........
+
+   The above loop encloses merely four tiles - the two pairs of . in the
+   southwest and southeast (marked I below). The middle . tiles (marked O
+   below) are not in the loop. Here is the same loop again with those regions
+   marked:
+
+ ...........
+ .S-------7.
+ .|F-----7|.
+ .||OOOOO||.
+ .||OOOOO||.
+ .|L-7OF-J|.
+ .|II|O|II|.
+ .L--JOL--J.
+ .....O.....
+
+   In fact, there doesn't even need to be a full tile path to the outside for
+   tiles to count as outside the loop - squeezing between pipes is also
+   allowed! Here, I is still within the loop and O is still outside the loop:
+
+ ..........
+ .S------7.
+ .|F----7|.
+ .||OOOO||.
+ .||OOOO||.
+ .|L-7F-J|.
+ .|II||II|.
+ .L--JL--J.
+ ..........
+
+   In both of the above examples, 4 tiles are enclosed by the loop.
+
+   Here's a larger example:
+
+ .F----7F7F7F7F-7....
+ .|F--7||||||||FJ....
+ .||.FJ||||||||L7....
+ FJL7L7LJLJ||LJ.L-7..
+ L--J.L7...LJS7F-7L7.
+ ....F-J..F7FJ|L7L7L7
+ ....L7.F7||L7|.L7L7|
+ .....|FJLJ|FJ|F7|.LJ
+ ....FJL-7.||.||||...
+ ....L---J.LJ.LJLJ...
+
+   The above sketch has many random bits of ground, some of which are in the
+   loop (I) and some of which are outside it (O):
+
+ OF----7F7F7F7F-7OOOO
+ O|F--7||||||||FJOOOO
+ O||OFJ||||||||L7OOOO
+ FJL7L7LJLJ||LJIL-7OO
+ L--JOL7IIILJS7F-7L7O
+ OOOOF-JIIF7FJ|L7L7L7
+ OOOOL7IF7||L7|IL7L7|
+ OOOOO|FJLJ|FJ|F7|OLJ
+ OOOOFJL-7O||O||||OOO
+ OOOOL---JOLJOLJLJOOO
+
+   In this larger example, 8 tiles are enclosed by the loop.
+
+   Any tile that isn't part of the main loop can count as being enclosed by
+   the loop. Here's another example with many bits of junk pipe lying around
+   that aren't connected to the main loop at all:
+
+ FF7FSF7F7F7F7F7F---7
+ L|LJ||||||||||||F--J
+ FL-7LJLJ||||||LJL-77
+ F--JF--7||LJLJ7F7FJ-
+ L---JF-JLJ.||-FJLJJ7
+ |F|F-JF---7F7-L7L|7|
+ |FFJF7L7F-JF7|JL---7
+ 7-L-JL7||F7|L7F-7F7|
+ L.L7LFJ|||||FJL7||LJ
+ L7JLJL-JLJLJL--JLJ.L
+
+   Here are just the tiles that are enclosed by the loop marked with I:
+
+ FF7FSF7F7F7F7F7F---7
+ L|LJ||||||||||||F--J
+ FL-7LJLJ||||||LJL-77
+ F--JF--7||LJLJIF7FJ-
+ L---JF-JLJIIIIFJLJJ7
+ |F|F-JF---7IIIL7L|7|
+ |FFJF7L7F-JF7IIL---7
+ 7-L-JL7||F7|L7F-7F7|
+ L.L7LFJ|||||FJL7||LJ
+ L7JLJL-JLJLJL--JLJ.L
+
+   In this last example, 10 tiles are enclosed by the loop.
+
+   Figure out whether you have time to search for the nest by calculating the
+   area within the loop. How many tiles are enclosed by the loop?
+
+   Your puzzle answer was 297.
+
+   Both parts of this puzzle are complete! They provide two gold stars: **
+
+   At this point, you should [17]return to your Advent calendar and try
+   another puzzle.
+
+   If you still want to see it, you can [18]get your puzzle input.
+
+   You can also [Shareon [19]Twitter [20]Mastodon] this puzzle.
+
+References
+
+   Visible links
+   1. https://adventofcode.com/
+   2. https://adventofcode.com/2023/about
+   3. https://adventofcode.com/2023/events
+   4. https://teespring.com/stores/advent-of-code
+   5. https://adventofcode.com/2023/settings
+   6. https://adventofcode.com/2023/auth/logout
+   7. Advent of Code Supporter
+	https://adventofcode.com/2023/support
+   8. https://adventofcode.com/2023
+   9. https://adventofcode.com/2023
+  10. https://adventofcode.com/2023/support
+  11. https://adventofcode.com/2023/sponsors
+  12. https://adventofcode.com/2023/leaderboard
+  13. https://adventofcode.com/2023/stats
+  14. https://adventofcode.com/2023/sponsors
+  15. https://kotlinlang.org/
+  16. https://en.wikipedia.org/wiki/Hot_spring
+  17. https://adventofcode.com/2023
+  18. https://adventofcode.com/2023/day/10/input
+  19. https://twitter.com/intent/tweet?text=I%27ve+completed+%22Pipe+Maze%22+%2D+Day+10+%2D+Advent+of+Code+2023&url=https%3A%2F%2Fadventofcode%2Ecom%2F2023%2Fday%2F10&related=ericwastl&hashtags=AdventOfCode
+  20. javascript:void(0);

2023/day10/testinput1

@@ -0,0 +1,5 @@
+-L|F7
+7S-7|
+L|7||
+-L-J|
+L|-JF

2023/day10/testinput2

@@ -0,0 +1,5 @@
+7-F7-
+.FJ|7
+SJLL7
+|F--J
+LJ.LJ

2023/day10/testinput3

@@ -0,0 +1,9 @@
+...........
+.S-------7.
+.|F-----7|.
+.||.....||.
+.||.....||.
+.|L-7.F-J|.
+.|..|.|..|.
+.L--J.L--J.
+...........

2023/day10/testinput4

@@ -0,0 +1,10 @@
+.F----7F7F7F7F-7....
+.|F--7||||||||FJ....
+.||.FJ||||||||L7....
+FJL7L7LJLJ||LJ.L-7..
+L--J.L7...LJS7F-7L7.
+....F-J..F7FJ|L7L7L7
+....L7.F7||L7|.L7L7|
+.....|FJLJ|FJ|F7|.LJ
+....FJL-7.||.||||...
+....L---J.LJ.LJLJ...

helpers/coordinate.go

@@ -184,3 +184,12 @@ func GetHighestX(list ...Coordinate) int {
 	}
 	return top
 }
+
+func CoordListContains(needle Coordinate, haystack []Coordinate) bool {
+	for _, chk := range haystack {
+		if chk.Equals(needle) {
+			return true
+		}
+	}
+	return false
+}