Add rectangles exercise (#124)

config.json

@@ -674,6 +674,14 @@
         "prerequisites": [],
         "difficulty": 8
       },
+      {
+        "slug": "rectangles",
+        "name": "Rectangles",
+        "uuid": "2c6df8fc-766e-44a5-b30c-0cc14a451c93",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 8
+      },
       {
         "slug": "game-of-life",
         "name": "Conway's Game of Life",

exercises/practice/rectangles/.docs/instructions.md

@@ -0,0 +1,63 @@
+# Instructions
+
+Count the rectangles in an ASCII diagram like the one below.
+
+```text
+   +--+
+  ++  |
++-++--+
+|  |  |
++--+--+
+```
+
+The above diagram contains these 6 rectangles:
+
+```text
+
+
++-----+
+|     |
++-----+
+```
+
+```text
+   +--+
+   |  |
+   |  |
+   |  |
+   +--+
+```
+
+```text
+   +--+
+   |  |
+   +--+
+
+
+```
+
+```text
+
+
+   +--+
+   |  |
+   +--+
+```
+
+```text
+
+
++--+
+|  |
++--+
+```
+
+```text
+
+  ++
+  ++
+
+
+```
+
+You may assume that the input is always a proper rectangle (i.e. the length of every line equals the length of the first line).

exercises/practice/rectangles/.meta/config.json

@@ -0,0 +1,17 @@
+{
+  "authors": [
+    "erikschierboom"
+  ],
+  "files": {
+    "solution": [
+      "rectangles.ua"
+    ],
+    "test": [
+      "tests.ua"
+    ],
+    "example": [
+      ".meta/example.ua"
+    ]
+  },
+  "blurb": "Count the rectangles in an ASCII diagram."
+}

exercises/practice/rectangles/.meta/example.ua

@@ -0,0 +1,12 @@
+Parse     ← ⊜∘≠@\n.
+Rectangle ← /↧≡(≍⊃↙↘2) ⍜(↙2↘1⊢|⇌) ⍉
+Corners   ← ▽≡Rectangle. ⧅<4 ⊚=@+
+Valid ← (
+  ⊙¤
+  ∩(⍜(-|⇡+1) ⊃(⊢|⊣))°⊟⍉
+  ↧⊃(
+    /↧∊"+-"♭≡⊡⊞⊂⊂⊃(⊢|⊣)
+  | /↧∊"+|"♭≡⊡⊞⊂⊙(⊂⊃(⊢|⊣))
+  )
+)
+Rectangles ← /+ ≡Valid ⊙¤ ⊸Corners Parse

exercises/practice/rectangles/.meta/tests.toml

@@ -0,0 +1,54 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[485b7bab-4150-40aa-a8db-73013427d08c]
+description = "no rows"
+include = false
+
+[076929ed-27e8-45dc-b14b-08279944dc49]
+description = "no columns"
+include = false
+
+[0a8abbd1-a0a4-4180-aa4e-65c1b1a073fa]
+description = "no rectangles"
+
+[a4ba42e9-4e7f-4973-b7c7-4ce0760ac6cd]
+description = "one rectangle"
+
+[ced06550-83da-4d23-98b7-d24152e0db93]
+description = "two rectangles without shared parts"
+
+[5942d69a-a07c-41c8-8b93-2d13877c706a]
+description = "five rectangles with shared parts"
+
+[82d70be4-ab37-4bf2-a433-e33778d3bbf1]
+description = "rectangle of height 1 is counted"
+
+[57f1bc0e-2782-401e-ab12-7c01d8bfc2e0]
+description = "rectangle of width 1 is counted"
+
+[ef0bb65c-bd80-4561-9535-efc4067054f9]
+description = "1x1 square is counted"
+
+[e1e1d444-e926-4d30-9bf3-7d8ec9a9e330]
+description = "only complete rectangles are counted"
+
+[ca021a84-1281-4a56-9b9b-af14113933a4]
+description = "rectangles can be of different sizes"
+
+[51f689a7-ef3f-41ae-aa2f-5ea09ad897ff]
+description = "corner is required for a rectangle to be complete"
+
+[d78fe379-8c1b-4d3c-bdf7-29bfb6f6dc66]
+description = "large input with many rectangles"
+
+[6ef24e0f-d191-46da-b929-4faca24b4cd2]
+description = "rectangles must have four sides"

exercises/practice/rectangles/rectangles.ua

@@ -0,0 +1,3 @@
+# Count the number of rectangles in a grid
+# Count ? Grid
+Rectangles ← |1 ⊙(⍤"Please implement Rectangles" 0)

exercises/practice/rectangles/tests.ua

@@ -0,0 +1,88 @@
+~ "rectangles.ua" ~ Rectangles
+
+# No rectangles
+Grid ← $  
+⍤⤙≍ 0 Rectangles Grid
+
+# One rectangle
+Grid ← $ +-+
+       $ | |
+       $ +-+
+⍤⤙≍ 1 Rectangles Grid
+
+# Two rectangles without shared parts
+Grid ← $   +-+
+       $   | |
+       $ +-+-+
+       $ | |  
+       $ +-+  
+⍤⤙≍ 2 Rectangles Grid
+
+# Five rectangles with shared parts
+Grid ← $   +-+
+       $   | |
+       $ +-+-+
+       $ | | |
+       $ +-+-+
+⍤⤙≍ 5 Rectangles Grid
+
+# Rectangle of height 1 is counted
+Grid ← $ +--+
+       $ +--+
+⍤⤙≍ 1 Rectangles Grid
+
+# Rectangle of width 1 is counted
+Grid ← $ ++
+       $ ||
+       $ ++
+⍤⤙≍ 1 Rectangles Grid
+
+# 1x1 square is counted
+Grid ← $ ++
+       $ ++
+⍤⤙≍ 1 Rectangles Grid
+
+# Only complete rectangles are counted
+Grid ← $   +-+
+       $     |
+       $ +-+-+
+       $ | | -
+       $ +-+-+
+⍤⤙≍ 1 Rectangles Grid
+
+# Rectangles can be of different sizes
+Grid ← $ +------+----+
+       $ |      |    |
+       $ +---+--+    |
+       $ |   |       |
+       $ +---+-------+
+⍤⤙≍ 3 Rectangles Grid
+
+# Corner is required for a rectangle to be complete
+Grid ← $ +------+----+
+       $ |      |    |
+       $ +------+    |
+       $ |   |       |
+       $ +---+-------+
+⍤⤙≍ 2 Rectangles Grid
+
+# Large input with many rectangles
+Grid ← $ +---+--+----+
+       $ |   +--+----+
+       $ +---+--+    |
+       $ |   +--+----+
+       $ +---+--+--+-+
+       $ +---+--+--+-+
+       $ +------+  | |
+       $           +-+
+⍤⤙≍ 60 Rectangles Grid
+
+# Rectangles must have four sides
+Grid ← $ +-+ +-+
+       $ | | | |
+       $ +-+-+-+
+       $   | |  
+       $ +-+-+-+
+       $ | | | |
+       $ +-+ +-+
+⍤⤙≍ 5 Rectangles Grid