freeCodeCamp/curriculum/challenges/italian/22-rosetta-code/rosetta-code-challenges/knapsack-problem-unbounded.md

id, title, challengeType, forumTopicId, dashedName

id	title	challengeType	forumTopicId	dashedName
5a23c84252665b21eecc7ed4	Problema dello Zaino/Non limitato	1	323655	knapsack-problemunbounded

--description--

A traveler gets diverted and has to make an unscheduled stop in what turns out to be Shangri-La. Opting to leave, he is allowed to take as much as he likes of the items available there, so long as it will fit in his knapsack, and he can carry it.

Sa che non può portare più di un particolare valore di peso massimo totale; e che la capacità del suo zaino ha un volume limitato.

Guardando appena sopra i codici a barre sugli articoli trova i loro pesi e volumi. Va a ripescare la sua recente copia di un documento finanziario e ottiene il valore di ogni voce.

Può solo prendere unità intere di qualsiasi oggetto, ma c'è molto di più di qualsiasi oggetto che potrebbe mai trasportare.

--instructions--

Scrivi una funzione che richiede una serie di oggetti, il peso massimo e il volume massimo come parametri. Ogni oggetto ha 4 attributi: nome, valore, peso e volume. La funzione dovrebbe restituire il valore massimo degli articoli che il viaggiatore può portare con sé.

--hints--

knapsackUnbounded([{ name:"panacea", value:3000, weight:0.3, volume:0.025 }, { name:"ichor", value:1800, weight:0.2, volume:0.015 }, { name:"gold", value:2500, weight:2, volume:0.002 }], 25, 0.25) dovrebbe restituire 54500.

assert.equal(
  knapsackUnbounded(
    [
      { name: 'panacea', value: 3000, weight: 0.3, volume: 0.025 },
      { name: 'ichor', value: 1800, weight: 0.2, volume: 0.015 },
      { name: 'gold', value: 2500, weight: 2, volume: 0.002 }
    ],
    25,
    0.25
  ),
  54500
);

knapsackUnbounded([{ name:"panacea", value:3000, weight:0.3, volume:0.025 }, { name:"ichor", value:1800, weight:0.2, volume:0.015 }, { name:"gold", value:2500, weight:2, volume:0.002 }], 55, 0.25) dovrebbe restituire 88400.

assert.equal(
  knapsackUnbounded(
    [
      { name: 'panacea', value: 3000, weight: 0.3, volume: 0.025 },
      { name: 'ichor', value: 1800, weight: 0.2, volume: 0.015 },
      { name: 'gold', value: 2500, weight: 2, volume: 0.002 }
    ],
    55,
    0.25
  ),
  88400
);

knapsackUnbounded([{ name:"panacea", value:3000, weight:0.3, volume:0.025 }, { name:"ichor", value:1800, weight:0.2, volume:0.015 }, { name:"gold", value:2500, weight:2, volume:0.002 }], 25, 0.15) dovrebbe restituire 42500.

assert.equal(
  knapsackUnbounded(
    [
      { name: 'panacea', value: 3000, weight: 0.3, volume: 0.025 },
      { name: 'ichor', value: 1800, weight: 0.2, volume: 0.015 },
      { name: 'gold', value: 2500, weight: 2, volume: 0.002 }
    ],
    25,
    0.15
  ),
  42500
);

knapsackUnbounded([{ name:"panacea", value:3000, weight:0.3, volume:0.025 }, { name:"ichor", value:1800, weight:0.2, volume:0.015 }, { name:"gold", value:2500, weight:2, volume:0.002 }], 35, 0.35) dovrebbe restituire 75900.

assert.equal(
  knapsackUnbounded(
    [
      { name: 'panacea', value: 3000, weight: 0.3, volume: 0.025 },
      { name: 'ichor', value: 1800, weight: 0.2, volume: 0.015 },
      { name: 'gold', value: 2500, weight: 2, volume: 0.002 }
    ],
    35,
    0.35
  ),
  75900
);

knapsackUnbounded([{ name:"panacea", value:3000, weight:0.3, volume:0.025 }, { name:"ichor", value:1800, weight:0.2, volume:0.015 }, { name:"gold", value:2500, weight:2, volume:0.002 }], 15, 0.25) dovrebbe restituire 43200.

assert.equal(
  knapsackUnbounded(
    [
      { name: 'panacea', value: 3000, weight: 0.3, volume: 0.025 },
      { name: 'ichor', value: 1800, weight: 0.2, volume: 0.015 },
      { name: 'gold', value: 2500, weight: 2, volume: 0.002 }
    ],
    15,
    0.25
  ),
  43200
);

--seed--

--seed-contents--

function knapsackUnbounded(items, maxweight, maxvolume) {

}

--solutions--

function knapsackUnbounded(items, maxWeight, maxVolume) {
  function getPickTotals(items, pick) {
    let totalValue = 0;
    let totalWeight = 0;
    let totalVolume = 0;
    for (let i = 0; i < items.length; i++) {
      totalValue += pick[i] * items[i].value;
      totalWeight += pick[i] * items[i].weight;
      totalVolume += pick[i] * items[i].volume;
    }
    return [totalValue, totalWeight, totalVolume];
  }

  function getMaxes(items, maxWeight, maxVolume) {
    const maxes = [];
    for (let i = 0; i < items.length; i++) {
      const maxUnitsInWeight = Math.floor(maxWeight / items[i].weight);
      const maxUnitsInVolume = Math.floor(maxVolume / items[i].volume);
      const maxUnitsInLimit = Math.min(maxUnitsInWeight, maxUnitsInVolume);
      maxes.push(maxUnitsInLimit);
    }
    return maxes;
  }

  function isInLimit(value, limit) {
    return value <= limit;
  }

  function getCombinations(maxValues, curPicks, combinations) {
    if (maxValues.length === 0) {
      combinations.push(curPicks);
    }

    const curMax = maxValues[0];
    const leftMaxValues = maxValues.slice(1);
    for (let i = 0; i <= curMax; i++) {
      getCombinations(leftMaxValues, curPicks.concat(i), combinations);
    }
    return combinations;
  }

  let bestValue = 0;
  let bestPick = [];
  const maxes = getMaxes(items, maxWeight, maxVolume);
  const combinations = getCombinations(maxes, [], []);
  for (let i = 0; i < combinations.length; i++) {
    const curPick = combinations[i];
    const [curValue, curWeight, curVolume] = getPickTotals(items, curPick);
    if (!isInLimit(curWeight, maxWeight) || !isInLimit(curVolume, maxVolume)) {
      continue;
    }

    if (curValue > bestValue) {
      bestValue = curValue;
      bestPick = [curPick];
    } else if (curValue === bestValue) {
      bestPick.push(curPick);
    }
  }

  return bestValue;
}