Added day10 part 2

Author: Gentleman1983

build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 // project meta data
 group 'de.havox_design.aoc2023'
-version '0.9.2'
+version '0.9.3'
 
 // Switch to gradle "all" distribution.
 wrapper {

day10/README.md

@@ -118,3 +118,109 @@ Here are the distances for each tile on that loop:
 ```
 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**?
+
+# 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**?

day10/src/test/kotlin/de/havox_design/aoc2023/day10/Day10Test.kt

@@ -34,7 +34,10 @@ class Day10Test {
         @JvmStatic
         private fun getDataForTestSolvePart2(): Stream<Arguments> =
             Stream.of(
-                Arguments.of("part2sample1.txt", 0L)
+                Arguments.of("part2sample1.txt", 0L),
+                Arguments.of("part2sample2.txt", 0L),
+                Arguments.of("part2sample3.txt", 0L),
+                Arguments.of("part2sample4.txt", 0L)
             )
     }
 }

day10/src/test/resources/part2sample1.txt

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

day10/src/test/resources/part2sample2.txt

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

day10/src/test/resources/part2sample3.txt

@@ -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...

day10/src/test/resources/part2sample4.txt

@@ -0,0 +1,10 @@
+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