Comments (4)
Thank you for the fix @shsina . It is now in master branch.
from javascript-algorithms.
the Unbounded knapsack problem ignores the total number of itemsInStock
const possibleKnapsackItems = [
new KnapsackItem({ value: 1, weight: 1, itemsInStock: 10 }),
new KnapsackItem({ value: 100, weight: 100, itemsInStock: 100 }),
new KnapsackItem({ value: 50, weight: 50, itemsInStock: 2 }),
new KnapsackItem({ value: 1000, weight: 1000, itemsInStock: 5 }),
];
const maxKnapsackWeight = 76;
const knapsack = new Knapsack(possibleKnapsackItems, maxKnapsackWeight);
knapsack.solveUnboundedKnapsackProblem();
console.log(knapsack.totalValue);
console.log(knapsack.totalWeight);
console.log(knapsack.selectedItems.length);
console.log(knapsack.selectedItems[0]);
console.log(knapsack.selectedItems[1]);
76
76
2
KnapsackItem { value: 1, weight: 1, itemsInStock: 10, quantity: 26 }
KnapsackItem { value: 50, weight: 50, itemsInStock: 2, quantity: 1 }
from javascript-algorithms.
will fix as below , I will make e pr:
solveUnboundedKnapsackProblem() {
this.sortPossibleItemsByValue();
this.sortPossibleItemsByValuePerWeightRatio();
for (let itemIndex = 0; itemIndex < this.possibleItems.length; itemIndex += 1) {
if (this.totalWeight < this.weightLimit) {
const currentItem = this.possibleItems[itemIndex];
// Detect how much of current items we can push to knapsack.
// if(currentItem.quantity == currentItem.itemsInStock) return;
const availableWeight = this.weightLimit - this.totalWeight;
const maxPossibleItemsCount = Math.floor(availableWeight / currentItem.weight);
if (maxPossibleItemsCount) {
if(maxPossibleItemsCount <= currentItem.itemsInStock){
currentItem.quantity = maxPossibleItemsCount;
}else{
currentItem.quantity = currentItem.itemsInStock;
}
this.selectedItems.push(currentItem);
}
}
}
}
from javascript-algorithms.
Nice catch @shsina. Waiting for PR.
from javascript-algorithms.
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from javascript-algorithms.