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ErikSchierboomErikSchierboom
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Add knapsack exercise
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‎config.json‎

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"transforming"
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]
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},
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{
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"slug": "knapsack",
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"name": "Knapsack",
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"uuid": "f1827715-0e86-42f2-b07d-4d70e8c2e043",
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"practices": [],
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"prerequisites": [
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"numbers",
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"vectors",
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"conditionals"
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],
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"difficulty": 5
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},
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{
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"slug": "luhn",
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"name": "Luhn",

‎exercises/practice/knapsack/.docs/instructions.md‎

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# Instructions
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Your task is to determine which items to take so that the total value of her selection is maximized, taking into account the knapsack's carrying capacity.
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Items will be represented as a list of items.
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Each item will have a weight and value.
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All values given will be strictly positive.
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Lhakpa can take only one of each item.
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For example:
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```text
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Items: [
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{ "weight": 5, "value": 10 },
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{ "weight": 4, "value": 40 },
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{ "weight": 6, "value": 30 },
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{ "weight": 4, "value": 50 }
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]
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Knapsack Maximum Weight: 10
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```
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For the above, the first item has weight 5 and value 10, the second item has weight 4 and value 40, and so on.
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In this example, Lhakpa should take the second and fourth item to maximize her value, which, in this case, is 90.
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She cannot get more than 90 as her knapsack has a weight limit of 10.

‎exercises/practice/knapsack/.docs/introduction.md‎

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# Introduction
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Lhakpa is a [Sherpa][sherpa] mountain guide and porter.
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After months of careful planning, the expedition Lhakpa works for is about to leave.
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She will be paid the value she carried to the base camp.
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In front of her are many items, each with a value and weight.
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Lhakpa would gladly take all of the items, but her knapsack can only hold so much weight.
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[sherpa]: https://en.wikipedia.org/wiki/Sherpa_people#Mountaineering

‎exercises/practice/knapsack/.meta/config.json‎

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{
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"authors": [
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"erikschierboom"
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],
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"files": {
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"solution": [
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"src/knapsack.clj"
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],
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"test": [
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"test/knapsack_test.clj"
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],
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"example": [
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".meta/example.clj"
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]
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},
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"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.",
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"source": "Wikipedia",
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"source_url": "https://en.wikipedia.org/wiki/Knapsack_problem"
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}

‎exercises/practice/knapsack/.meta/example.clj‎

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(ns knapsack)
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(defn maximum-value [maximum-weight items]
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(if (empty? items)
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0
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(max
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(if (<= (:weight (first items)) maximum-weight)
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(+
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(:value (first items))
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(maximum-value (- maximum-weight (:weight (first items))) (rest items)))
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0)
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(maximum-value maximum-weight (rest items)))))

‎exercises/practice/knapsack/.meta/generator.clj‎

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(ns knapsack-generator
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(:require [hbs.helper :refer [safe-str]]))
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(defn- update-item [item]
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(safe-str (str item)))
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(defn- update-items [items]
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(safe-str (templates/format-vector items (templates/formatter-chain update-item))))
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(defn transform-test-case [test-case]
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(update-in test-case [:input :items] update-items))

‎exercises/practice/knapsack/.meta/generator.tpl‎

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(ns knapsack-test
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(:require [clojure.test :refer [deftest testing is]]
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knapsack))
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{{#test_cases.maximumValue}}
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(deftest maximum-value_test_{{idx}}
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(testing {{description}}
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(is (= {{expected}} (knapsack/maximum-value {{input.maximumWeight}} {{input.items}})))))
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{{/test_cases.maximumValue~}}

‎exercises/practice/knapsack/.meta/tests.toml‎

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[a4d7d2f0-ad8a-460c-86f3-88ba709d41a7]
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description = "no items"
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include = false
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[3993a824-c20e-493d-b3c9-ee8a7753ee59]
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description = "no items"
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reimplements = "a4d7d2f0-ad8a-460c-86f3-88ba709d41a7"
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[1d39e98c-6249-4a8b-912f-87cb12e506b0]
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description = "one item, too heavy"
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[833ea310-6323-44f2-9d27-a278740ffbd8]
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description = "five items (cannot be greedy by weight)"
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[277cdc52-f835-4c7d-872b-bff17bab2456]
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description = "five items (cannot be greedy by value)"
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[81d8e679-442b-4f7a-8a59-7278083916c9]
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description = "example knapsack"
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[f23a2449-d67c-4c26-bf3e-cde020f27ecc]
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description = "8 items"
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[7c682ae9-c385-4241-a197-d2fa02c81a11]
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description = "15 items"

‎exercises/practice/knapsack/deps.edn‎

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{:aliases {:test {:extra-paths ["test"]
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:extra-deps {io.github.cognitect-labs/test-runner
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{:git/url "https://github.com/cognitect-labs/test-runner.git"
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:sha "705ad25bbf0228b1c38d0244a36001c2987d7337"}}
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:main-opts ["-m" "cognitect.test-runner"]
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:exec-fn cognitect.test-runner.api/test}}}

‎exercises/practice/knapsack/project.clj‎

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(defproject knapsack "0.1.0-SNAPSHOT"
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:description "knapsack exercise."
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:url "https://github.com/exercism/clojure/tree/main/exercises/practice/knapsack"
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:dependencies [[org.clojure/clojure "1.11.1"]])

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