Add Yacht exercise (#339)

* Add Yacht exercise

* Small bug in four-of-a-kind

* Capitalize category names in test descriptions

* s/Full house/Full House/

Author: blakelewis

config.json

@@ -590,6 +590,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 2
+      },
+      {
+        "slug": "yacht",
+        "name": "Yacht",
+        "uuid": "039e844c-da0b-4e3e-8910-c697429c2350",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 1
       }
     ]
   },

exercises/practice/yacht/.docs/instructions.md

@@ -0,0 +1,35 @@
+# Instructions
+
+The dice game [Yacht][yacht] is from the same family as Poker Dice, Generala and particularly Yahtzee, of which it is a precursor.
+In the game, five dice are rolled and the result can be entered in any of twelve categories.
+The score of a throw of the dice depends on category chosen.
+
+## Scores in Yacht
+
+| Category        | Score                  | Description                              | Example             |
+| --------------- | ---------------------- | ---------------------------------------- | ------------------- |
+| Ones            | 1 × number of ones     | Any combination                          | 1 1 1 4 5 scores 3  |
+| Twos            | 2 × number of twos     | Any combination                          | 2 2 3 4 5 scores 4  |
+| Threes          | 3 × number of threes   | Any combination                          | 3 3 3 3 3 scores 15 |
+| Fours           | 4 × number of fours    | Any combination                          | 1 2 3 3 5 scores 0  |
+| Fives           | 5 × number of fives    | Any combination                          | 5 1 5 2 5 scores 15 |
+| Sixes           | 6 × number of sixes    | Any combination                          | 2 3 4 5 6 scores 6  |
+| Full House      | Total of the dice      | Three of one number and two of another   | 3 3 3 5 5 scores 19 |
+| Four of a Kind  | Total of the four dice | At least four dice showing the same face | 4 4 4 4 6 scores 16 |
+| Little Straight | 30 points              | 1-2-3-4-5                                | 1 2 3 4 5 scores 30 |
+| Big Straight    | 30 points              | 2-3-4-5-6                                | 2 3 4 5 6 scores 30 |
+| Choice          | Sum of the dice        | Any combination                          | 2 3 3 4 6 scores 18 |
+| Yacht           | 50 points              | All five dice showing the same face      | 4 4 4 4 4 scores 50 |
+
+If the dice do not satisfy the requirements of a category, the score is zero.
+If, for example, _Four Of A Kind_ is entered in the _Yacht_ category, zero points are scored.
+A _Yacht_ scores zero if entered in the _Full House_ category.
+
+## Task
+
+Given a list of values for five dice and a category, your solution should return the score of the dice for that category.
+If the dice do not satisfy the requirements of the category your solution should return 0.
+You can assume that five values will always be presented, and the value of each will be between one and six inclusively.
+You should not assume that the dice are ordered.
+
+[yacht]: https://en.wikipedia.org/wiki/Yacht_(dice_game)

exercises/practice/yacht/.meta/config.json

@@ -0,0 +1,17 @@
+{
+  "authors": ["blakelewis"],
+  "files": {
+    "solution": [
+      "yacht.rkt"
+    ],
+    "test": [
+      "yacht-test.rkt"
+    ],
+    "example": [
+      ".meta/example.rkt"
+    ]
+  },
+  "blurb": "Score a single throw of dice in the game Yacht.",
+  "source": "James Kilfiger, using wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Yacht_(dice_game)"
+}

exercises/practice/yacht/.meta/example.rkt

@@ -0,0 +1,52 @@
+#lang racket
+
+(provide yacht)
+
+(define (sum-of-dice value dice)
+  (* value (count (λ (d) (= d value)) dice)))
+
+(define (sorted-groups dice)
+  (sort (group-by identity dice)
+	(λ (x y) (> (length x) (length y)))))
+
+(define (full-house dice)
+  (let ([groups (sorted-groups dice)])
+    (if (and (= (length groups) 2)
+	     (= (length (car groups)) 3))
+      (apply + dice)
+      0)))
+
+(define (four-of-a-kind dice)
+  (let ([groups (sorted-groups dice)])
+    (if (or (and (= (length groups) 2)
+	         (= (length (car groups)) 4))
+	    (= (length groups) 1))
+      (* 4 (caar groups))
+      0)))
+
+(define (straight start dice)
+  (let ([groups (sorted-groups dice)])
+    (if (and (= (length groups) 5)
+	     (= (apply min dice) start)
+	     (= (apply max dice) (+ start 4)))
+      30
+      0)))
+
+(define (five-of-a-kind dice)
+  (if (= (length (sorted-groups dice)) 1) 50 0))
+
+(define (yacht dice category)
+  (cond [(string=? category "ones") (sum-of-dice 1 dice)]
+	[(string=? category "twos") (sum-of-dice 2 dice)]
+	[(string=? category "threes") (sum-of-dice 3 dice)]
+	[(string=? category "fours") (sum-of-dice 4 dice)]
+	[(string=? category "fives") (sum-of-dice 5 dice)]
+	[(string=? category "sixes") (sum-of-dice 6 dice)]
+	[(string=? category "full house") (full-house dice)]
+	[(string=? category "four of a kind") (four-of-a-kind dice)]
+	[(string=? category "little straight") (straight 1 dice)]
+	[(string=? category "big straight") (straight 2 dice)]
+	[(string=? category "choice") (apply + dice)]
+	[(string=? category "yacht") (five-of-a-kind dice)]
+	[else (error "unknown category")]))
+

exercises/practice/yacht/.meta/tests.toml

@@ -0,0 +1,97 @@
+# 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.
+
+[3060e4a5-4063-4deb-a380-a630b43a84b6]
+description = "Yacht"
+
+[15026df2-f567-482f-b4d5-5297d57769d9]
+description = "Not Yacht"
+
+[36b6af0c-ca06-4666-97de-5d31213957a4]
+description = "Ones"
+
+[023a07c8-6c6e-44d0-bc17-efc5e1b8205a]
+description = "Ones, out of order"
+
+[7189afac-cccd-4a74-8182-1cb1f374e496]
+description = "No ones"
+
+[793c4292-dd14-49c4-9707-6d9c56cee725]
+description = "Twos"
+
+[dc41bceb-d0c5-4634-a734-c01b4233a0c6]
+description = "Fours"
+
+[f6125417-5c8a-4bca-bc5b-b4b76d0d28c8]
+description = "Yacht counted as threes"
+
+[464fc809-96ed-46e4-acb8-d44e302e9726]
+description = "Yacht of 3s counted as fives"
+
+[d054227f-3a71-4565-a684-5c7e621ec1e9]
+description = "Fives"
+
+[e8a036e0-9d21-443a-8b5f-e15a9e19a761]
+description = "Sixes"
+
+[51cb26db-6b24-49af-a9ff-12f53b252eea]
+description = "Full house two small, three big"
+
+[1822ca9d-f235-4447-b430-2e8cfc448f0c]
+description = "Full house three small, two big"
+
+[b208a3fc-db2e-4363-a936-9e9a71e69c07]
+description = "Two pair is not a full house"
+
+[b90209c3-5956-445b-8a0b-0ac8b906b1c2]
+description = "Four of a kind is not a full house"
+
+[32a3f4ee-9142-4edf-ba70-6c0f96eb4b0c]
+description = "Yacht is not a full house"
+
+[b286084d-0568-4460-844a-ba79d71d79c6]
+description = "Four of a Kind"
+
+[f25c0c90-5397-4732-9779-b1e9b5f612ca]
+description = "Yacht can be scored as Four of a Kind"
+
+[9f8ef4f0-72bb-401a-a871-cbad39c9cb08]
+description = "Full house is not Four of a Kind"
+
+[b4743c82-1eb8-4a65-98f7-33ad126905cd]
+description = "Little Straight"
+
+[7ac08422-41bf-459c-8187-a38a12d080bc]
+description = "Little Straight as Big Straight"
+
+[97bde8f7-9058-43ea-9de7-0bc3ed6d3002]
+description = "Four in order but not a little straight"
+
+[cef35ff9-9c5e-4fd2-ae95-6e4af5e95a99]
+description = "No pairs but not a little straight"
+
+[fd785ad2-c060-4e45-81c6-ea2bbb781b9d]
+description = "Minimum is 1, maximum is 5, but not a little straight"
+
+[35bd74a6-5cf6-431a-97a3-4f713663f467]
+description = "Big Straight"
+
+[87c67e1e-3e87-4f3a-a9b1-62927822b250]
+description = "Big Straight as little straight"
+
+[c1fa0a3a-40ba-4153-a42d-32bc34d2521e]
+description = "No pairs but not a big straight"
+
+[207e7300-5d10-43e5-afdd-213e3ac8827d]
+description = "Choice"
+
+[b524c0cf-32d2-4b40-8fb3-be3500f3f135]
+description = "Yacht as choice"

exercises/practice/yacht/yacht-test.rkt

@@ -0,0 +1,100 @@
+#lang racket/base
+
+(require "yacht.rkt")
+
+(module+ test
+  (require rackunit rackunit/text-ui))
+
+(module+ test
+  (define suite
+    (test-suite
+      "yacht tests"
+
+      (test-equal? "Yacht"
+		   (yacht '(5 5 5 5 5) "yacht") 50)
+
+      (test-equal? "Not Yacht"
+		   (yacht '(1 3 3 2 5) "yacht") 0)
+
+      (test-equal? "Ones"
+		   (yacht '(1 1 1 3 5) "ones") 3)
+
+      (test-equal? "Ones, out of order"
+		   (yacht '(3 1 1 5 1) "ones") 3)
+
+      (test-equal? "No Ones"
+		   (yacht '(4 3 6 5 5) "ones") 0)
+
+      (test-equal? "Twos"
+		   (yacht '(2 3 4 5 6) "twos") 2)
+
+      (test-equal? "Fours"
+		   (yacht '(1 4 1 4 1) "fours") 8)
+
+      (test-equal? "Yacht counted as Threes"
+		   (yacht '(3 3 3 3 3) "threes") 15)
+
+      (test-equal? "Yacht of 3s counted as Fives"
+		   (yacht '(3 3 3 3 3) "fives") 0)
+
+      (test-equal? "Fives"
+		   (yacht '(1 5 3 5 3) "fives") 10)
+
+      (test-equal? "Sixes"
+		   (yacht '(2 3 4 5 6) "sixes") 6)
+
+      (test-equal? "Full House two small, three big"
+		   (yacht '(2 2 4 4 4) "full house") 16)
+
+      (test-equal? "Full House three small, two big"
+		   (yacht '(5 3 3 5 3) "full house") 19)
+
+      (test-equal? "Two pair is not a Full House"
+		   (yacht '(2 2 4 4 5) "full house") 0)
+
+      (test-equal? "Four of a kind is not a Full House"
+		   (yacht '(1 4 4 4 4) "full house") 0)
+
+      (test-equal? "Yacht is not a Full House"
+		   (yacht '(2 2 2 2 2) "full house") 0)
+
+      (test-equal? "Four of a Kind"
+		   (yacht '(6 6 4 6 6) "four of a kind") 24)
+
+      (test-equal? "Yacht can be scored as Four of a Kind"
+		   (yacht '(3 3 3 3 3) "four of a kind") 12)
+
+      (test-equal? "Full House is not Four of a Kind"
+		   (yacht '(3 3 3 5 5) "four of a kind") 0)
+
+      (test-equal? "Little Straight"
+		   (yacht '(3 5 4 1 2) "little straight") 30)
+
+      (test-equal? "Little Straight as Big Straight"
+		   (yacht '(1 2 3 4 5) "big straight") 0)
+
+      (test-equal? "Four in order but not a Little Straight"
+		   (yacht '(1 1 2 3 4) "little straight") 0)
+
+      (test-equal? "No pairs but not a Little Straight"
+		   (yacht '(1 2 3 4 6) "little straight") 0)
+
+      (test-equal? "Minimum is 1, maximum is 5, but not a Little Straight"
+		   (yacht '(1 1 3 4 5) "little straight") 0)
+
+      (test-equal? "Big Straight"
+		   (yacht '(4 6 2 5 3) "big straight") 30)
+
+      (test-equal? "Big Straight as Little Straight"
+		   (yacht '(6 5 4 3 2) "little straight") 0)
+
+      (test-equal? "No pairs but not a Big Straight"
+		   (yacht '(6 5 4 3 1) "big straight") 0)
+
+      (test-equal? "Choice"
+		   (yacht '(3 3 5 6 6) "choice") 23)
+
+      (test-equal? "Yacht as Choice"
+		   (yacht '(2 2 2 2 2) "choice") 10)))
+
+  (run-tests suite))

exercises/practice/yacht/yacht.rkt

@@ -0,0 +1,6 @@
+#lang racket
+
+(provide yacht)
+
+(define (yacht dice category)
+  (error "Not implemented yet"))