implementation de la fonction explore_from

.idea/misc.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_23" default="true" project-jdk-name="18" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_22" default="true" project-jdk-name="18" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file

src/App.java

@@ -2,9 +2,8 @@ import java.util.List;
 
 public class App {
     public static void main(String[] args) throws Exception {
-       Backpack backpack= new InstanceReader().read("src/sacTest");
-       backpack.sortByRatio();
-       backpack.solutionFractionnelle();
-       System.out.println("solution fractionnelle :" + backpack.getSfValuee());
+       Backpack backpack= new InstanceReader().read("src/sac1");
+       backpack.solve();
+       System.out.println("meilleur solution :" + backpack.getBestValue());
     }
 }

src/Backpack.java

@@ -2,16 +2,29 @@ import java.util.Comparator;
 import java.util.List;
 
 public class Backpack {
-    int capacity;
-    List<Loot> loots;
-    int sfValuee = 0;
-    int sfWeight = 0;
+    private int capacity;
+    private List<Loot> loots;
+    private int sfValuee = 0;
+    private int sfWeight = 0;
+    private int bestValue = 0;
+    private boolean[] bestSolution;
+    private boolean[] currentSolution;
+    private int currentWeight = 0;
+    private int currentValue = 0;
 
     public Backpack(int capacity, List<Loot> loots) {
         this.capacity = capacity;
         this.loots = loots;
     }
 
+    public void solve() {
+        bestSolution = new boolean[loots.size()];
+        currentSolution = new boolean[loots.size()];
+        sortByRatio();
+        solutionFractionnelle();
+        explore_from(0);
+    }
+
     public String toString(){
         return capacity +"\n"+loots;
     }
@@ -41,8 +54,43 @@ public class Backpack {
         }
     }
 
+    private void explore_from(int index) {
+        // Si on a exploré tous les objets
+        if (index >= loots.size()) {
+            if (currentValue > bestValue) {
+                bestValue = currentValue;
+                System.arraycopy(currentSolution, 0, bestSolution, 0, loots.size());
+            }
+            return;
+        }
+
+        // Si la valeur actuelle + la valeur restante possible (sfValuee - valeur déjà utilisée)
+        // est inférieure à la meilleure solution, on coupe la branche
+        if (currentValue + (sfValuee - currentValue) <= bestValue) {
+            return;
+        }
+
+        // Branche gauche - avec l'objet
+        Loot currentLoot = loots.get(index);
+        if (currentWeight + currentLoot.getWeight() <= capacity) {
+            currentSolution[index] = true;
+            currentWeight += currentLoot.getWeight();
+            currentValue += currentLoot.getValue();
+            explore_from(index + 1);
+            currentWeight -= currentLoot.getWeight();
+            currentValue -= currentLoot.getValue();
+            currentSolution[index] = false;
+        }
+
+        // Branche droite - sans l'objet
+        explore_from(index + 1);
+    }
+
     public int getSfValuee() {
         return sfValuee;
     }
 
+    public int getBestValue() {
+        return bestValue;
+    }
 }

src/Loot.java

 public class Loot {
-    int weight, value;
-    float ratio;
+    private int weight, value;
+    private final float ratio;
 
     public Loot(int weight, int value) {
         this.weight = weight;