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84
Task/Knapsack-problem-0-1/Java/knapsack-problem-0-1-1.java
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84
Task/Knapsack-problem-0-1/Java/knapsack-problem-0-1-1.java
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package hu.pj.alg.test;
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import hu.pj.alg.ZeroOneKnapsack;
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import hu.pj.obj.Item;
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import java.util.*;
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import java.text.*;
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public class ZeroOneKnapsackForTourists {
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public ZeroOneKnapsackForTourists() {
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ZeroOneKnapsack zok = new ZeroOneKnapsack(400); // 400 dkg = 400 dag = 4 kg
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// making the list of items that you want to bring
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zok.add("map", 9, 150);
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zok.add("compass", 13, 35);
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zok.add("water", 153, 200);
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zok.add("sandwich", 50, 160);
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zok.add("glucose", 15, 60);
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zok.add("tin", 68, 45);
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zok.add("banana", 27, 60);
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zok.add("apple", 39, 40);
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zok.add("cheese", 23, 30);
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zok.add("beer", 52, 10);
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zok.add("suntan cream", 11, 70);
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zok.add("camera", 32, 30);
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zok.add("t-shirt", 24, 15);
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zok.add("trousers", 48, 10);
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zok.add("umbrella", 73, 40);
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zok.add("waterproof trousers", 42, 70);
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zok.add("waterproof overclothes", 43, 75);
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zok.add("note-case", 22, 80);
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zok.add("sunglasses", 7, 20);
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zok.add("towel", 18, 12);
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zok.add("socks", 4, 50);
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zok.add("book", 30, 10);
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// calculate the solution:
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List<Item> itemList = zok.calcSolution();
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// write out the solution in the standard output
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if (zok.isCalculated()) {
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NumberFormat nf = NumberFormat.getInstance();
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System.out.println(
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"Maximal weight = " +
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nf.format(zok.getMaxWeight() / 100.0) + " kg"
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);
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System.out.println(
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"Total weight of solution = " +
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nf.format(zok.getSolutionWeight() / 100.0) + " kg"
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);
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System.out.println(
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"Total value = " +
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zok.getProfit()
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);
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System.out.println();
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System.out.println(
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"You can carry the following materials " +
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"in the knapsack:"
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);
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for (Item item : itemList) {
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if (item.getInKnapsack() == 1) {
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System.out.format(
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"%1$-23s %2$-3s %3$-5s %4$-15s \n",
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item.getName(),
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item.getWeight(), "dag ",
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"(value = " + item.getValue() + ")"
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);
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}
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}
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} else {
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System.out.println(
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"The problem is not solved. " +
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"Maybe you gave wrong data."
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);
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}
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}
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public static void main(String[] args) {
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new ZeroOneKnapsackForTourists();
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}
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} // class
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154
Task/Knapsack-problem-0-1/Java/knapsack-problem-0-1-2.java
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Task/Knapsack-problem-0-1/Java/knapsack-problem-0-1-2.java
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package hu.pj.alg;
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import hu.pj.obj.Item;
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import java.util.*;
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public class ZeroOneKnapsack {
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protected List<Item> itemList = new ArrayList<Item>();
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protected int maxWeight = 0;
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protected int solutionWeight = 0;
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protected int profit = 0;
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protected boolean calculated = false;
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public ZeroOneKnapsack() {}
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public ZeroOneKnapsack(int _maxWeight) {
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setMaxWeight(_maxWeight);
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}
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public ZeroOneKnapsack(List<Item> _itemList) {
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setItemList(_itemList);
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}
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public ZeroOneKnapsack(List<Item> _itemList, int _maxWeight) {
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setItemList(_itemList);
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setMaxWeight(_maxWeight);
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}
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// calculte the solution of 0-1 knapsack problem with dynamic method:
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public List<Item> calcSolution() {
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int n = itemList.size();
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setInitialStateForCalculation();
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if (n > 0 && maxWeight > 0) {
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List< List<Integer> > c = new ArrayList< List<Integer> >();
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List<Integer> curr = new ArrayList<Integer>();
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c.add(curr);
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for (int j = 0; j <= maxWeight; j++)
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curr.add(0);
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for (int i = 1; i <= n; i++) {
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List<Integer> prev = curr;
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c.add(curr = new ArrayList<Integer>());
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for (int j = 0; j <= maxWeight; j++) {
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if (j > 0) {
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int wH = itemList.get(i-1).getWeight();
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curr.add(
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(wH > j)
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?
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prev.get(j)
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:
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Math.max(
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prev.get(j),
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itemList.get(i-1).getValue() + prev.get(j-wH)
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)
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);
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} else {
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curr.add(0);
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}
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} // for (j...)
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} // for (i...)
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profit = curr.get(maxWeight);
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for (int i = n, j = maxWeight; i > 0 && j >= 0; i--) {
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int tempI = c.get(i).get(j);
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int tempI_1 = c.get(i-1).get(j);
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if (
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(i == 0 && tempI > 0)
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||
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(i > 0 && tempI != tempI_1)
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)
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{
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Item iH = itemList.get(i-1);
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int wH = iH.getWeight();
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iH.setInKnapsack(1);
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j -= wH;
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solutionWeight += wH;
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}
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} // for()
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calculated = true;
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} // if()
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return itemList;
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}
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// add an item to the item list
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public void add(String name, int weight, int value) {
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if (name.equals(""))
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name = "" + (itemList.size() + 1);
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itemList.add(new Item(name, weight, value));
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setInitialStateForCalculation();
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}
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// add an item to the item list
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public void add(int weight, int value) {
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add("", weight, value); // the name will be "itemList.size() + 1"!
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}
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// remove an item from the item list
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public void remove(String name) {
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for (Iterator<Item> it = itemList.iterator(); it.hasNext(); ) {
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if (name.equals(it.next().getName())) {
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it.remove();
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}
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}
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setInitialStateForCalculation();
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}
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// remove all items from the item list
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public void removeAllItems() {
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itemList.clear();
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setInitialStateForCalculation();
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}
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public int getProfit() {
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if (!calculated)
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calcSolution();
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return profit;
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}
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public int getSolutionWeight() {return solutionWeight;}
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public boolean isCalculated() {return calculated;}
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public int getMaxWeight() {return maxWeight;}
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public void setMaxWeight(int _maxWeight) {
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maxWeight = Math.max(_maxWeight, 0);
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}
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public void setItemList(List<Item> _itemList) {
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if (_itemList != null) {
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itemList = _itemList;
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for (Item item : _itemList) {
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item.checkMembers();
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}
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}
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}
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// set the member with name "inKnapsack" by all items:
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private void setInKnapsackByAll(int inKnapsack) {
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for (Item item : itemList)
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if (inKnapsack > 0)
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item.setInKnapsack(1);
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else
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item.setInKnapsack(0);
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}
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// set the data members of class in the state of starting the calculation:
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protected void setInitialStateForCalculation() {
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setInKnapsackByAll(0);
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calculated = false;
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profit = 0;
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solutionWeight = 0;
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}
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} // class
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71
Task/Knapsack-problem-0-1/Java/knapsack-problem-0-1-3.java
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Task/Knapsack-problem-0-1/Java/knapsack-problem-0-1-3.java
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package hu.pj.obj;
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public class Item {
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protected String name = "";
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protected int weight = 0;
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protected int value = 0;
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protected int bounding = 1; // the maximal limit of item's pieces
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protected int inKnapsack = 0; // the pieces of item in solution
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public Item() {}
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public Item(Item item) {
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setName(item.name);
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setWeight(item.weight);
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setValue(item.value);
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setBounding(item.bounding);
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}
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public Item(int _weight, int _value) {
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setWeight(_weight);
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setValue(_value);
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}
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public Item(int _weight, int _value, int _bounding) {
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setWeight(_weight);
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setValue(_value);
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setBounding(_bounding);
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}
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public Item(String _name, int _weight, int _value) {
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setName(_name);
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setWeight(_weight);
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setValue(_value);
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}
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public Item(String _name, int _weight, int _value, int _bounding) {
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setName(_name);
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setWeight(_weight);
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setValue(_value);
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setBounding(_bounding);
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}
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public void setName(String _name) {name = _name;}
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public void setWeight(int _weight) {weight = Math.max(_weight, 0);}
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public void setValue(int _value) {value = Math.max(_value, 0);}
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public void setInKnapsack(int _inKnapsack) {
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inKnapsack = Math.min(getBounding(), Math.max(_inKnapsack, 0));
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}
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public void setBounding(int _bounding) {
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bounding = Math.max(_bounding, 0);
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if (bounding == 0)
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inKnapsack = 0;
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}
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public void checkMembers() {
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setWeight(weight);
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setValue(value);
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setBounding(bounding);
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setInKnapsack(inKnapsack);
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}
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public String getName() {return name;}
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public int getWeight() {return weight;}
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public int getValue() {return value;}
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public int getInKnapsack() {return inKnapsack;}
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public int getBounding() {return bounding;}
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} // class
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