Add ProportionalFairScheduling algorithm (#5812)

src/main/java/com/thealgorithms/scheduling/ProportionalFairScheduling.java

@@ -0,0 +1,54 @@
+package com.thealgorithms.scheduling;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * ProportionalFairScheduling allocates resources to processes based on their
+ * proportional weight or importance. It aims to balance fairness with
+ * priority, ensuring that higher-weight processes receive a larger share of resources.
+ *
+ * Use Case: Network bandwidth allocation in cellular networks (4G/5G),
+ * where devices receive a proportional share of bandwidth.
+ *
+ * @author Hardvan
+ */
+public final class ProportionalFairScheduling {
+
+    static class Process {
+        String name;
+        int weight;
+        int allocatedResources;
+
+        Process(String name, int weight) {
+            this.name = name;
+            this.weight = weight;
+            this.allocatedResources = 0;
+        }
+    }
+
+    private final List<Process> processes;
+
+    public ProportionalFairScheduling() {
+        processes = new ArrayList<>();
+    }
+
+    public void addProcess(String name, int weight) {
+        processes.add(new Process(name, weight));
+    }
+
+    public void allocateResources(int totalResources) {
+        int totalWeight = processes.stream().mapToInt(p -> p.weight).sum();
+        for (Process process : processes) {
+            process.allocatedResources = (int) ((double) process.weight / totalWeight * totalResources);
+        }
+    }
+
+    public List<String> getAllocatedResources() {
+        List<String> allocation = new ArrayList<>();
+        for (Process process : processes) {
+            allocation.add(process.name + ": " + process.allocatedResources);
+        }
+        return allocation;
+    }
+}