From cc7c6c7e96b0faf1859ca680c80e086569ac6ac2 Mon Sep 17 00:00:00 2001
From: Ritika Goyal <54592421+goyalritika14@users.noreply.github.com>
Date: Mon, 4 Oct 2021 23:57:03 +0530
Subject: [PATCH] Create Fractional Knapsack.java

---
 Algo/Fractional Knapsack.java | 78 +++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 Algo/Fractional Knapsack.java

diff --git a/Algo/Fractional Knapsack.java b/Algo/Fractional Knapsack.java
new file mode 100644
index 0000000..b744e61
--- /dev/null
+++ b/Algo/Fractional Knapsack.java	
@@ -0,0 +1,78 @@
+
+import java.util.Arrays;
+import java.util.Comparator;
+
+
+public class FractionalKnapSack {
+	private static double getMaxValue(int[] wt, int[] val,int capacity)
+	{
+		ItemValue[] iVal = new ItemValue[wt.length];
+
+		for (int i = 0; i < wt.length; i++) {
+			iVal[i] = new ItemValue(wt[i], val[i], i);
+		}
+
+		
+		Arrays.sort(iVal, new Comparator<ItemValue>() {
+			@Override
+			public int compare(ItemValue o1, ItemValue o2)
+			{
+				return o2.cost.compareTo(o1.cost);
+			}
+		});
+
+		double totalValue = 0d;
+
+		for (ItemValue i : iVal) {
+
+			int curWt = (int)i.wt;
+			int curVal = (int)i.val;
+
+			if (capacity - curWt >= 0) {
+				
+				capacity = capacity - curWt;
+				totalValue += curVal;
+			}
+			else {
+				
+				double fraction
+					= ((double)capacity / (double)curWt);
+				totalValue += (curVal * fraction);
+				capacity
+					= (int)(capacity - (curWt * fraction));
+				break;
+			}
+		}
+
+		return totalValue;
+	}
+
+	
+	static class ItemValue {
+		Double cost;
+		double wt, val, ind;
+
+		
+		public ItemValue(int wt, int val, int ind)
+		{
+			this.wt = wt;
+			this.val = val;
+			this.ind = ind;
+			cost = new Double((double)val / (double)wt);
+		}
+	}
+
+	
+	public static void main(String[] args)
+	{
+		int[] wt = { 10, 40, 20, 30 };
+		int[] val = { 60, 40, 100, 120 };
+		int capacity = 50;
+
+		double maxValue = getMaxValue(wt, val, capacity);
+
+	
+		System.out.println("Maximum value we can obtain = "
+						+ maxValue);
+	}
+}