Add Knapsack exercise (#310)

* Add Knapsack exercise This also marks the regular expression string in the generate script as a raw string. This is required to to ensure the escapes are only interpreted as part of the regular expression. * Add back foregone exercises * Fix placement of foregone exercises
exercism · Jul 30, 2024 · e63e93e · e63e93e
1 parent e3c6ef2
commit e63e93e
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Showing 10 changed files with 363 additions and 63 deletions.
diff --git a/bin/generate b/bin/generate
@@ -66,7 +66,7 @@ def indent(n, s):
 
 
 def camelize(s):
-    return re.sub('[-_](\w)', lambda x: x.group(1).upper(), s)
+    return re.sub(r'[-_](\w)', lambda x: x.group(1).upper(), s)
 
 
 def sml_type(value, force=False):

diff --git a/config.json b/config.json
@@ -18,7 +18,6 @@
   "test_runner": {
     "average_run_time": 1
   },
-  "checklist_issue": 8,
   "files": {
     "solution": [
       "%{kebab_slug}.sml"
@@ -34,43 +33,38 @@
     ]
   },
   "exercises": {
-    "concept": [],
     "practice": [
       {
         "slug": "hello-world",
         "name": "Hello World",
         "uuid": "a00f98a6-98dd-4c8a-b3d1-adc1d56eef29",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "leap",
         "name": "Leap",
         "uuid": "622644a8-55c3-498e-ac72-ad6d7d31109d",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "two-fer",
         "name": "Two Fer",
         "uuid": "a56bad29-684c-47e7-9724-8c7f165a51af",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "scrabble-score",
         "name": "Scrabble Score",
         "uuid": "cc6e7e8d-84f8-4b85-8f5e-7a68b3b34b1f",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 3,
-        "topics": []
+        "difficulty": 3
       },
       {
         "slug": "space-age",
@@ -100,8 +94,7 @@
         "uuid": "d17ab3c6-82a1-413e-9018-8775ec9ea498",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "collatz-conjecture",
@@ -120,26 +113,23 @@
         "uuid": "38a13f45-9e80-4322-b896-d2cf06add3f9",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 3,
-        "topics": []
+        "difficulty": 3
       },
       {
         "slug": "kindergarten-garden",
         "name": "Kindergarten Garden",
         "uuid": "7d74175b-a2c6-4e77-a908-ebcbcf1e29b6",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 3,
-        "topics": []
+        "difficulty": 3
       },
       {
         "slug": "secret-handshake",
         "name": "Secret Handshake",
         "uuid": "55048224-25dc-4c91-b4f4-1ea1bacdd87f",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 3,
-        "topics": []
+        "difficulty": 3
       },
       {
         "slug": "matching-brackets",
@@ -188,8 +178,7 @@
         "uuid": "7be1122c-33cd-40ed-a70f-c71a6713c47a",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "binary",
@@ -198,7 +187,6 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 1,
-        "topics": null,
         "status": "deprecated"
       },
       {
@@ -208,7 +196,6 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 1,
-        "topics": [],
         "status": "deprecated"
       },
       {
@@ -228,26 +215,23 @@
         "uuid": "216334c2-bdb5-481a-a22b-20ac088f20e9",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "atbash-cipher",
         "name": "Atbash Cipher",
         "uuid": "0f488d4b-89da-4d1f-958b-a7b3171f43d5",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "bob",
         "name": "Bob",
         "uuid": "4fb40e77-727b-41bc-ac15-b909a26bb917",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "diamond",
@@ -279,8 +263,7 @@
         "uuid": "fb0a030d-33bc-4066-a30a-1b8b02cc42f1",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "wordy",
@@ -296,8 +279,7 @@
         "uuid": "ce5dd1a4-7c90-48e4-b260-d2b62f29fbaf",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "list-ops",
@@ -327,8 +309,7 @@
         "uuid": "5184de5a-4772-4389-aa3c-b1117b601450",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 5,
-        "topics": []
+        "difficulty": 5
       },
       {
         "slug": "perfect-numbers",
@@ -366,8 +347,7 @@
         "uuid": "24edacd5-6e6d-4d37-8486-25283dce806f",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 3,
-        "topics": []
+        "difficulty": 3
       },
       {
         "slug": "rotational-cipher",
@@ -386,8 +366,7 @@
         "uuid": "f923bffb-109f-4257-957c-cea8cae2d5c5",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "isogram",
@@ -441,8 +420,7 @@
         "uuid": "76b1e1d1-2360-487c-89be-37f9780540b7",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "resistor-color",
@@ -458,8 +436,7 @@
         "uuid": "db3e09ee-6c93-417f-b0a0-196cdccf4984",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 1,
-        "topics": []
+        "difficulty": 1
       },
       {
         "slug": "pythagorean-triplet",
@@ -478,8 +455,7 @@
         "uuid": "b4359037-8457-49ea-ac33-44710ada3b4d",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 5,
-        "topics": []
+        "difficulty": 5
       },
       {
         "slug": "sum-of-multiples",
@@ -534,8 +510,7 @@
         "uuid": "90237a3f-595a-4238-bcef-46d6f84b0945",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 2,
-        "topics": []
+        "difficulty": 2
       },
       {
         "slug": "gigasecond",
@@ -566,17 +541,15 @@
         "uuid": "a503a4e2-b6eb-4ab0-ac67-8b136157f3dd",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 4,
-        "topics": []
+        "difficulty": 4
       },
       {
         "slug": "yacht",
         "name": "Yacht",
         "uuid": "c4a24f88-febd-4955-a08d-67895a3d119f",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 4,
-        "topics": []
+        "difficulty": 4
       },
       {
         "slug": "triangle",
@@ -618,16 +591,22 @@
         "uuid": "95b2f13e-e59f-477c-905a-8cfa652607b3",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 6,
-        "topics": []
+        "difficulty": 6
+      },
+      {
+        "slug": "knapsack",
+        "name": "Knapsack",
+        "uuid": "4aaa8cbf-a48e-475a-a986-bd2cc3468e67",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 5
       }
+    ],
+    "foregone": [
+      "bank-account",
+      "parallel-letter-frequency"
     ]
   },
-  "foregone": [
-    "bank-account",
-    "parallel-letter-frequency"
-  ],
-  "concepts": [],
   "key_features": [
     {
       "title": "Algebraic data types",
@@ -661,15 +640,15 @@
     }
   ],
   "tags": [
+    "execution_mode/interpreted",
     "paradigm/functional",
     "paradigm/imperative",
-    "typing/static",
-    "typing/strong",
-    "execution_mode/interpreted",
-    "platform/windows",
-    "platform/mac",
     "platform/linux",
+    "platform/mac",
+    "platform/windows",
     "runtime/language_specific",
+    "typing/static",
+    "typing/strong",
     "used_for/financial_systems",
     "used_for/scientific_calculations"
   ]

diff --git a/exercises/practice/knapsack/.docs/instructions.md b/exercises/practice/knapsack/.docs/instructions.md
@@ -0,0 +1,25 @@
+# Instructions
+
+Your task is to determine which items to take so that the total value of his selection is maximized, taking into account the knapsack's carrying capacity.
+
+Items will be represented as a list of items.
+Each item will have a weight and value.
+All values given will be strictly positive.
+Bob can take only one of each item.
+
+For example:
+
+```text
+Items: [
+  { "weight": 5, "value": 10 },
+  { "weight": 4, "value": 40 },
+  { "weight": 6, "value": 30 },
+  { "weight": 4, "value": 50 }
+]
+
+Knapsack Maximum Weight: 10
+```
+
+For the above, the first item has weight 5 and value 10, the second item has weight 4 and value 40, and so on.
+In this example, Bob should take the second and fourth item to maximize his value, which, in this case, is 90.
+He cannot get more than 90 as his knapsack has a weight limit of 10.
diff --git a/exercises/practice/knapsack/.docs/introduction.md b/exercises/practice/knapsack/.docs/introduction.md
@@ -0,0 +1,8 @@
+# Introduction
+
+Bob is a thief.
+After months of careful planning, he finally manages to crack the security systems of a fancy store.
+
+In front of him are many items, each with a value and weight.
+Bob would gladly take all of the items, but his knapsack can only hold so much weight.
+Bob has to carefully consider which items to take so that the total value of his selection is maximized.
diff --git a/exercises/practice/knapsack/.meta/config.json b/exercises/practice/knapsack/.meta/config.json
@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "kahgoh"
+  ],
+  "files": {
+    "solution": [
+      "knapsack.sml"
+    ],
+    "test": [
+      "test.sml"
+    ],
+    "example": [
+      ".meta/example.sml"
+    ]
+  },
+  "blurb": "Given a knapsack that can only carry a certain weight, determine which items to put in the knapsack in order to maximize their combined value.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Knapsack_problem"
+}