diff --git a/2023/22/Makefile b/2023/22/Makefile
new file mode 100644
index 0000000..27dfdc0
--- /dev/null
+++ b/2023/22/Makefile
@@ -0,0 +1,17 @@
+main1:
+	go build -o main1 main1.go common.go
+
+main2:
+	go build -o main2 main2.go common.go
+
+.PHONY: run1 run2 clean
+
+run1: main1
+	./main1 <input
+
+run2: main2
+	./main2 <input
+
+clean:
+	rm -f main1 main2
+
diff --git a/2023/22/assignment b/2023/22/assignment
new file mode 100644
index 0000000..8d372b0
--- /dev/null
+++ b/2023/22/assignment
@@ -0,0 +1,193 @@
+--- Day 22: Sand Slabs ---
+
+   Enough sand has fallen; it can finally filter water for Snow Island.
+
+   Well, almost .
+
+   The sand has been falling as large compacted bricks of sand, piling up
+   to form an impressive stack here near the edge of Island Island. In
+   order to make use of the sand to filter water, some of the bricks will
+   need to be broken apart - nay, disintegrated - back into freely flowing
+   sand.
+
+   The stack is tall enough that you'll have to be careful about choosing
+   which bricks to disintegrate; if you disintegrate the wrong brick,
+   large portions of the stack could topple, which sounds pretty
+   dangerous.
+
+   The Elves responsible for water filtering operations took a snapshot of
+   the bricks while they were still falling (your puzzle input) which
+   should let you work out which bricks are safe to disintegrate. For
+   example:
+
+        1,0,1~1,2,1
+        0,0,2~2,0,2
+        0,2,3~2,2,3
+        0,0,4~0,2,4
+        2,0,5~2,2,5
+        0,1,6~2,1,6
+        1,1,8~1,1,9
+
+   Each line of text in the snapshot represents the position of a single
+   brick at the time the snapshot was taken. The position is given as two
+   x,y,z coordinates - one for each end of the brick - separated by a
+   tilde ( ~ ). Each brick is made up of a single straight line of cubes,
+   and the Elves were even careful to choose a time for the snapshot that
+   had all of the free-falling bricks at integer positions above the
+   ground , so the whole snapshot is aligned to a three-dimensional cube
+   grid.
+
+   A line like 2,2,2~2,2,2 means that both ends of the brick are at the
+   same coordinate - in other words, that the brick is a single cube.
+
+   Lines like 0,0,10~1,0,10 or 0,0,10~0,1,10 both represent bricks that
+   are two cubes in volume, both oriented horizontally. The first brick
+   extends in the x direction, while the second brick extends in the y
+   direction.
+
+   A line like 0,0,1~0,0,10 represents a ten-cube brick which is oriented
+   vertically . One end of the brick is the cube located at 0,0,1 , while
+   the other end of the brick is located directly above it at 0,0,10 .
+
+   The ground is at z=0 and is perfectly flat; the lowest z value a brick
+   can have is therefore 1 . So, 5,5,1~5,6,1 and 0,2,1~0,2,5 are both
+   resting on the ground, but 3,3,2~3,3,3 was above the ground at the time
+   of the snapshot.
+
+   Because the snapshot was taken while the bricks were still falling,
+   some bricks will still be in the air ; you'll need to start by figuring
+   out where they will end up. Bricks are magically stabilized, so they
+   never rotate , even in weird situations like where a long horizontal
+   brick is only supported on one end. Two bricks cannot occupy the same
+   position, so a falling brick will come to rest upon the first other
+   brick it encounters.
+
+   Here is the same example again, this time with each brick given a
+   letter so it can be marked in diagrams:
+
+        1,0,1~1,2,1   <- A
+        0,0,2~2,0,2   <- B
+        0,2,3~2,2,3   <- C
+        0,0,4~0,2,4   <- D
+        2,0,5~2,2,5   <- E
+        0,1,6~2,1,6   <- F
+        1,1,8~1,1,9   <- G
+
+   At the time of the snapshot, from the side so the x axis goes left to
+   right, these bricks are arranged like this:
+
+         x
+        012
+        .G. 9
+        .G. 8
+        ... 7
+        FFF 6
+        ..E 5 z
+        D.. 4
+        CCC 3
+        BBB 2
+        .A. 1
+        --- 0
+
+   Rotating the perspective 90 degrees so the y axis now goes left to
+   right, the same bricks are arranged like this:
+
+         y
+        012
+        .G. 9
+        .G. 8
+        ... 7
+        .F. 6
+        EEE 5 z
+        DDD 4
+        ..C 3
+        B.. 2
+        AAA 1
+        --- 0
+
+   Once all of the bricks fall downward as far as they can go, the stack
+   looks like this, where ? means bricks are hidden behind other bricks at
+   that location:
+
+         x
+        012
+        .G. 6
+        .G. 5
+        FFF 4
+        D.E 3 z
+        ??? 2
+        .A. 1
+        --- 0
+
+   Again from the side:
+
+         y
+        012
+        .G. 6
+        .G. 5
+        .F. 4
+        ??? 3 z
+        B.C 2
+        AAA 1
+        --- 0
+
+   Now that all of the bricks have settled, it becomes easier to tell
+   which bricks are supporting which other bricks:
+     * Brick A is the only brick supporting bricks B and C .
+     * Brick B is one of two bricks supporting brick D and brick E .
+     * Brick C is the other brick supporting brick D and brick E .
+     * Brick D supports brick F .
+     * Brick E also supports brick F .
+     * Brick F supports brick G .
+     * Brick G isn't supporting any bricks.
+
+   Your first task is to figure out which bricks are safe to disintegrate
+   . A brick can be safely disintegrated if, after removing it, no other
+   bricks would fall further directly downward. Don't actually
+   disintegrate any bricks - just determine what would happen if, for each
+   brick, only that brick were disintegrated. Bricks can be disintegrated
+   even if they're completely surrounded by other bricks; you can squeeze
+   between bricks if you need to.
+
+   In this example, the bricks can be disintegrated as follows:
+     * Brick A cannot be disintegrated safely; if it were disintegrated,
+       bricks B and C would both fall.
+     * Brick B can be disintegrated; the bricks above it ( D and E ) would
+       still be supported by brick C .
+     * Brick C can be disintegrated; the bricks above it ( D and E ) would
+       still be supported by brick B .
+     * Brick D can be disintegrated; the brick above it ( F ) would still
+       be supported by brick E .
+     * Brick E can be disintegrated; the brick above it ( F ) would still
+       be supported by brick D .
+     * Brick F cannot be disintegrated; the brick above it ( G ) would
+       fall.
+     * Brick G can be disintegrated; it does not support any other bricks.
+
+   So, in this example, 5 bricks can be safely disintegrated.
+
+   Figure how the blocks will settle based on the snapshot. Once they've
+   settled, consider disintegrating a single brick; how many bricks could
+   be safely chosen as the one to get disintegrated?
+
+--- Part Two ---
+
+   Disintegrating bricks one at a time isn't going to be fast enough.
+   While it might sound dangerous, what you really need is a chain
+   reaction .
+
+   You'll need to figure out the best brick to disintegrate. For each
+   brick, determine how many other bricks would fall if that brick were
+   disintegrated.
+
+   Using the same example as above:
+     * Disintegrating brick A would cause all 6 other bricks to fall.
+     * Disintegrating brick F would cause only 1 other brick, G , to fall.
+
+   Disintegrating any other brick would cause no other bricks to fall. So,
+   in this example, the sum of the number of other bricks that would fall
+   as a result of disintegrating each brick is 7 .
+
+   For each brick, determine how many other bricks would fall if that
+   brick were disintegrated. What is the sum of the number of other bricks
+   that would fall?
diff --git a/2023/22/common.go b/2023/22/common.go
new file mode 100644
index 0000000..1e81663
--- /dev/null
+++ b/2023/22/common.go
@@ -0,0 +1,136 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+type P struct{ X, Y, Z int }
+
+type Brick struct {
+	ID         int
+	Start, End P
+}
+
+type Space struct {
+	Map    map[P]int
+	Bricks map[int]*Brick
+}
+
+func parse() *Space {
+	s := NewSpace()
+	scanner := bufio.NewScanner(os.Stdin)
+	for i := 0; scanner.Scan(); i++ {
+		ff := strings.Split(scanner.Text(), "~")
+		var start, end P
+		_, _ = fmt.Sscanf(ff[0], "%d,%d,%d", &start.X, &start.Y, &start.Z)
+		_, _ = fmt.Sscanf(ff[1], "%d,%d,%d", &end.X, &end.Y, &end.Z)
+		s.Add(&Brick{i, start, end})
+	}
+	return s
+}
+
+func NewSpace() *Space {
+	return &Space{
+		Map:    make(map[P]int),
+		Bricks: make(map[int]*Brick),
+	}
+}
+
+func (s *Space) Add(b *Brick) {
+	s.Bricks[b.ID] = b
+	for x := b.Start.X; x <= b.End.X; x++ {
+		for y := b.Start.Y; y <= b.End.Y; y++ {
+			for z := b.Start.Z; z <= b.End.Z; z++ {
+				s.Map[P{x, y, z}] = b.ID
+			}
+		}
+	}
+}
+
+func (s *Space) Fall() int {
+	fallen := map[int]struct{}{}
+	for changed := true; changed; {
+		changed = false
+		for _, b := range s.Bricks {
+			for s.EmptyBelow(b) {
+				s.Move(b, P{0, 0, -1})
+				changed = true
+				fallen[b.ID] = struct{}{}
+			}
+		}
+	}
+	return len(fallen)
+}
+
+func (s *Space) EmptyBelow(b *Brick) bool {
+	if b.Start.Z == 1 {
+		return false
+	}
+	for x := b.Start.X; x <= b.End.X; x++ {
+		for y := b.Start.Y; y <= b.End.Y; y++ {
+			if _, full := s.Map[P{x, y, b.Start.Z - 1}]; full {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+func (s *Space) Move(b *Brick, p P) {
+	for x := b.Start.X; x <= b.End.X; x++ {
+		for y := b.Start.Y; y <= b.End.Y; y++ {
+			for z := b.Start.Z; z <= b.End.Z; z++ {
+				delete(s.Map, P{x, y, z})
+			}
+		}
+	}
+	for x := b.Start.X + p.X; x <= b.End.X+p.X; x++ {
+		for y := b.Start.Y + p.Y; y <= b.End.Y+p.Y; y++ {
+			for z := b.Start.Z + p.Z; z <= b.End.Z+p.Z; z++ {
+				s.Map[P{x, y, z}] = b.ID
+			}
+		}
+	}
+
+	s.Bricks[b.ID].Start.X += p.X
+	s.Bricks[b.ID].Start.Y += p.Y
+	s.Bricks[b.ID].Start.Z += p.Z
+	s.Bricks[b.ID].End.X += p.X
+	s.Bricks[b.ID].End.Y += p.Y
+	s.Bricks[b.ID].End.Z += p.Z
+}
+
+func (s *Space) TopOf(b *Brick) []*Brick {
+	var onTop []*Brick
+	for x := b.Start.X; x <= b.End.X; x++ {
+		for y := b.Start.Y; y <= b.End.Y; y++ {
+			if id, ok := s.Map[P{x, y, b.End.Z + 1}]; ok {
+				onTop = append(onTop, s.Bricks[id])
+			}
+		}
+	}
+	return onTop
+}
+
+func (s *Space) SafeToDisintegrate(b *Brick) bool {
+	for _, topB := range s.TopOf(b) {
+		if s.DependsOn(topB, b) {
+			return false
+		}
+	}
+	return true
+}
+
+func (s *Space) DependsOn(topB, botB *Brick) bool {
+	for x := topB.Start.X; x <= topB.End.X; x++ {
+		for y := topB.Start.Y; y <= topB.End.Y; y++ {
+			if id, full := s.Map[P{x, y, topB.Start.Z - 1}]; full && id != botB.ID {
+				return false
+			}
+		}
+	}
+	return true
+}
diff --git a/2023/22/input b/2023/22/input
new file mode 100644
index 0000000..5705710
--- /dev/null
+++ b/2023/22/input
@@ -0,0 +1,1471 @@
+7,6,107~7,8,107
+4,6,229~4,6,231
+6,4,110~8,4,110
+2,8,255~2,8,258
+8,3,318~9,3,318
+7,7,41~9,7,41
+8,5,285~8,7,285
+7,5,23~9,5,23
+3,2,67~6,2,67
+3,5,299~4,5,299
+2,0,257~2,0,258
+6,0,6~6,4,6
+7,0,31~7,0,34
+5,6,133~5,7,133
+4,0,241~4,2,241
+9,2,255~9,4,255
+5,5,29~7,5,29
+5,7,334~5,9,334
+6,2,169~8,2,169
+4,4,299~6,4,299
+1,3,26~3,3,26
+4,7,204~4,9,204
+6,1,121~6,3,121
+3,6,146~4,6,146
+5,7,97~5,9,97
+0,3,68~2,3,68
+5,7,85~6,7,85
+0,0,29~0,2,29
+0,4,223~2,4,223
+9,3,217~9,5,217
+1,2,256~1,3,256
+7,0,315~7,2,315
+7,7,93~8,7,93
+2,1,88~4,1,88
+6,8,232~6,9,232
+1,5,270~3,5,270
+9,1,19~9,1,21
+0,1,323~2,1,323
+2,0,331~4,0,331
+4,6,275~7,6,275
+0,1,278~2,1,278
+1,4,188~1,7,188
+5,1,184~5,3,184
+1,2,80~3,2,80
+6,1,280~6,5,280
+0,5,316~2,5,316
+1,5,156~1,7,156
+8,7,292~8,9,292
+9,1,178~9,3,178
+0,3,203~2,3,203
+1,1,36~1,4,36
+6,1,268~6,4,268
+3,4,269~5,4,269
+2,8,271~5,8,271
+9,3,118~9,6,118
+9,1,65~9,3,65
+0,9,193~1,9,193
+6,9,97~6,9,98
+5,2,188~5,5,188
+2,5,86~2,7,86
+1,5,317~1,7,317
+0,6,70~2,6,70
+7,3,336~7,3,336
+7,1,145~7,4,145
+3,1,83~6,1,83
+2,2,332~2,4,332
+3,5,32~6,5,32
+2,0,112~2,3,112
+5,2,122~6,2,122
+7,4,117~8,4,117
+4,4,245~6,4,245
+3,8,72~6,8,72
+1,3,341~1,3,343
+0,6,230~2,6,230
+9,1,105~9,1,109
+2,8,140~4,8,140
+5,4,181~7,4,181
+5,8,52~7,8,52
+2,2,199~2,4,199
+0,7,101~2,7,101
+9,0,131~9,1,131
+2,2,122~2,3,122
+4,9,299~7,9,299
+3,2,99~3,5,99
+5,1,90~7,1,90
+0,0,195~0,1,195
+4,9,211~7,9,211
+6,3,124~8,3,124
+3,2,246~5,2,246
+1,3,282~1,4,282
+9,8,98~9,8,100
+3,6,344~3,6,344
+4,5,61~4,6,61
+5,1,217~7,1,217
+6,1,104~8,1,104
+2,6,83~2,7,83
+9,2,64~9,5,64
+0,2,78~2,2,78
+2,8,151~2,9,151
+8,3,98~8,5,98
+3,6,244~3,9,244
+4,0,210~5,0,210
+3,9,19~3,9,19
+3,7,59~5,7,59
+9,9,76~9,9,79
+0,8,141~2,8,141
+1,1,34~3,1,34
+7,1,295~7,3,295
+3,9,331~5,9,331
+5,4,247~8,4,247
+0,6,241~2,6,241
+8,5,263~8,6,263
+4,0,255~6,0,255
+4,0,150~6,0,150
+0,7,281~2,7,281
+0,2,2~0,5,2
+5,0,26~8,0,26
+6,1,220~7,1,220
+0,6,141~0,7,141
+7,6,184~7,8,184
+6,0,129~8,0,129
+7,9,159~7,9,161
+5,6,143~7,6,143
+9,0,253~9,3,253
+6,3,256~6,5,256
+0,4,196~2,4,196
+3,6,92~3,6,94
+3,0,237~3,3,237
+7,8,280~9,8,280
+5,3,170~5,3,173
+4,6,266~6,6,266
+9,7,119~9,9,119
+5,9,303~7,9,303
+3,1,26~6,1,26
+5,6,5~5,8,5
+3,4,265~6,4,265
+7,8,7~7,9,7
+8,6,75~8,8,75
+9,4,199~9,5,199
+2,8,69~4,8,69
+6,1,198~6,1,200
+1,1,160~1,4,160
+5,5,18~8,5,18
+3,2,94~3,3,94
+1,4,245~1,5,245
+0,6,199~0,6,200
+5,4,52~5,7,52
+3,5,295~3,7,295
+8,5,68~8,6,68
+3,1,306~5,1,306
+0,3,94~2,3,94
+7,7,65~7,7,67
+1,7,215~1,8,215
+0,3,273~2,3,273
+1,2,191~3,2,191
+6,4,80~6,6,80
+7,7,149~9,7,149
+5,9,259~5,9,259
+4,3,213~4,5,213
+1,3,322~2,3,322
+8,2,62~8,4,62
+3,8,230~5,8,230
+8,2,84~9,2,84
+2,4,346~2,6,346
+4,7,140~7,7,140
+5,3,66~8,3,66
+7,3,28~7,6,28
+3,0,242~4,0,242
+2,4,187~2,6,187
+4,2,90~4,3,90
+3,5,165~5,5,165
+1,2,9~2,2,9
+6,0,17~9,0,17
+0,0,200~0,0,201
+7,3,72~7,4,72
+4,4,227~5,4,227
+4,7,215~6,7,215
+7,4,234~7,7,234
+7,1,8~7,2,8
+0,5,217~2,5,217
+0,6,142~2,6,142
+1,3,297~4,3,297
+1,4,9~3,4,9
+8,4,26~8,7,26
+6,8,213~6,9,213
+8,5,322~8,7,322
+2,4,156~2,6,156
+2,0,45~2,3,45
+1,3,275~4,3,275
+4,1,6~4,1,7
+7,4,291~7,6,291
+1,0,158~1,3,158
+7,0,294~7,3,294
+7,6,261~9,6,261
+2,0,114~2,3,114
+7,8,279~7,8,279
+0,6,157~3,6,157
+4,5,88~4,7,88
+0,7,271~3,7,271
+2,5,90~2,7,90
+0,8,100~2,8,100
+3,2,278~3,5,278
+3,7,82~5,7,82
+7,9,255~8,9,255
+0,8,101~1,8,101
+7,6,263~7,7,263
+5,6,23~5,8,23
+3,7,77~5,7,77
+4,8,243~6,8,243
+8,2,186~8,2,188
+3,3,102~3,3,105
+0,6,323~3,6,323
+2,6,67~4,6,67
+0,2,165~0,4,165
+7,0,103~7,3,103
+6,4,58~9,4,58
+8,1,15~9,1,15
+3,2,222~3,3,222
+6,0,245~8,0,245
+5,2,143~5,3,143
+2,3,319~2,5,319
+0,5,39~3,5,39
+8,8,271~9,8,271
+7,3,236~9,3,236
+1,0,201~3,0,201
+0,9,3~1,9,3
+4,4,289~4,6,289
+0,1,160~0,3,160
+8,5,39~8,7,39
+1,1,66~1,4,66
+2,7,282~2,7,284
+9,5,72~9,8,72
+5,1,193~5,3,193
+6,0,190~9,0,190
+3,5,245~3,7,245
+2,4,249~2,5,249
+8,9,195~8,9,196
+2,8,172~3,8,172
+6,5,270~9,5,270
+0,0,167~0,0,169
+6,1,336~6,2,336
+6,1,66~6,2,66
+2,3,295~2,5,295
+8,0,189~8,2,189
+5,3,239~5,3,241
+0,0,170~0,1,170
+5,5,19~6,5,19
+2,2,194~2,4,194
+3,2,122~3,5,122
+8,7,288~8,8,288
+4,1,78~5,1,78
+7,2,249~7,5,249
+6,3,41~6,5,41
+0,4,242~3,4,242
+0,2,189~0,2,189
+5,0,140~5,2,140
+7,2,129~7,3,129
+2,2,17~3,2,17
+4,3,266~6,3,266
+6,7,224~7,7,224
+3,1,206~5,1,206
+1,2,178~1,5,178
+0,7,144~0,8,144
+0,9,194~1,9,194
+3,7,297~3,9,297
+6,9,14~8,9,14
+2,5,214~2,6,214
+5,2,55~5,4,55
+0,4,1~0,7,1
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+3,8,212~5,8,212
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+6,4,55~6,7,55
+4,2,145~4,4,145
+9,4,157~9,6,157
+3,6,199~3,8,199
+3,3,84~4,3,84
+5,0,307~5,2,307
+0,6,60~0,8,60
+1,8,96~3,8,96
+3,7,64~3,9,64
+1,8,144~3,8,144
+6,1,241~6,2,241
+0,6,158~0,6,158
+8,5,282~8,7,282
+6,2,11~6,2,13
+3,1,124~3,3,124
+1,2,45~1,4,45
+5,7,181~7,7,181
+6,6,283~6,7,283
+0,8,274~0,8,275
+0,8,174~2,8,174
+9,9,162~9,9,164
+5,0,258~7,0,258
+7,8,45~7,9,45
+9,5,294~9,7,294
+2,0,90~5,0,90
+3,4,101~3,5,101
+5,2,160~8,2,160
+8,7,91~8,9,91
+5,5,229~5,8,229
+8,6,69~9,6,69
+5,2,172~7,2,172
+0,6,320~3,6,320
+6,8,242~8,8,242
+0,1,96~0,1,98
+2,8,173~2,9,173
+8,8,13~8,8,14
+0,1,285~0,3,285
+6,0,45~6,3,45
diff --git a/2023/22/main1.go b/2023/22/main1.go
new file mode 100644
index 0000000..bdb3bb0
--- /dev/null
+++ b/2023/22/main1.go
@@ -0,0 +1,16 @@
+package main
+
+import "fmt"
+
+func main() {
+	space := parse()
+	_ = space.Fall()
+
+	count := 0
+	for _, b := range space.Bricks {
+		if space.SafeToDisintegrate(b) {
+			count++
+		}
+	}
+	fmt.Println(count)
+}
diff --git a/2023/22/main2.go b/2023/22/main2.go
new file mode 100644
index 0000000..2871b3a
--- /dev/null
+++ b/2023/22/main2.go
@@ -0,0 +1,42 @@
+package main
+
+import "fmt"
+
+func main() {
+	space := parse()
+	_ = space.Fall()
+
+	count := 0
+	for i := 0; i < len(space.Bricks); i++ {
+		s2 := space.DeepCopy()
+		s2.Delete(space.Bricks[i])
+		count += s2.Fall()
+	}
+	fmt.Println(count)
+}
+
+func (s *Space) Delete(b *Brick) {
+	for x := b.Start.X; x <= b.End.X; x++ {
+		for y := b.Start.Y; y <= b.End.Y; y++ {
+			for z := b.Start.Z; z <= b.End.Z; z++ {
+				delete(s.Map, P{x, y, z})
+			}
+		}
+	}
+	delete(s.Bricks, b.ID)
+}
+
+func (s *Space) DeepCopy() *Space {
+	s2 := NewSpace()
+	for k, v := range s.Bricks {
+		s2.Bricks[k] = &Brick{
+			ID:    v.ID,
+			Start: v.Start,
+			End:   v.End,
+		}
+	}
+	for k, v := range s.Map {
+		s2.Map[k] = v
+	}
+	return s2
+}
diff --git a/2023/22/output1 b/2023/22/output1
new file mode 100644
index 0000000..678dee3
--- /dev/null
+++ b/2023/22/output1
@@ -0,0 +1 @@
+527
diff --git a/2023/22/output2 b/2023/22/output2
new file mode 100644
index 0000000..5d7dd4b
--- /dev/null
+++ b/2023/22/output2
@@ -0,0 +1 @@
+100376