2022 day 14, parts 1 & 2, before cleaning

2022/day14/README.org

@@ -172,3 +172,61 @@ the path any new sand takes before falling forever is shown here with
 
 Using your scan, simulate the falling sand. /How many units of sand come
 to rest before sand starts flowing into the abyss below?/
+
+Your puzzle answer was =665=.
+
+** --- Part Two ---
+You realize you misread the scan. There isn't an endless void at the
+bottom of the scan - there's floor, and you're standing on it!
+
+You don't have time to scan the floor, so assume the floor is an
+infinite horizontal line with a =y= coordinate equal to /two plus the
+highest =y= coordinate/ of any point in your scan.
+
+In the example above, the highest =y= coordinate of any point is =9=,
+and so the floor is at =y=11=. (This is as if your scan contained one
+extra rock path like =-infinity,11 -> infinity,11=.) With the added
+floor, the example above now looks like this:
+
+#+begin_example
+        ...........+........
+        ....................
+        ....................
+        ....................
+        .........#...##.....
+        .........#...#......
+        .......###...#......
+        .............#......
+        .............#......
+        .....#########......
+        ....................
+<-- etc #################### etc -->
+#+end_example
+
+To find somewhere safe to stand, you'll need to simulate falling sand
+until a unit of sand comes to rest at =500,0=, blocking the source
+entirely and stopping the flow of sand into the cave. In the example
+above, the situation finally looks like this after =93= units of sand
+come to rest:
+
+#+begin_example
+............o............
+...........ooo...........
+..........ooooo..........
+.........ooooooo.........
+........oo#ooo##o........
+.......ooo#ooo#ooo.......
+......oo###ooo#oooo......
+.....oooo.oooo#ooooo.....
+....oooooooooo#oooooo....
+...ooo#########ooooooo...
+..ooooo.......ooooooooo..
+#########################
+#+end_example
+
+Using your scan, simulate the falling sand until the source of the sand
+becomes blocked. /How many units of sand come to rest?/
+
+Your puzzle answer was =25434=.
+
+Both parts of this puzzle are complete! They provide two gold stars: **