Kadane's Algorithm added

NISHITA97 · NISHITA97 · commit 62fdf0d44e80 · 2017-12-08T02:33:47.000+05:30
diff --git a/Dynamic Programming/KadaneAlgorithm.java b/Dynamic Programming/KadaneAlgorithm.java
@@ -0,0 +1,55 @@
+import java.util.Scanner;
+
+/**
+ * Program to implement Kadane&rsquo;s Algorithm to 
+ * calculate maximum contiguous subarray sum of an array
+ * Time Complexity: O(n)
+ * 
+ * @author Nishita Aggarwal
+ *
+ */
+
+public class KadaneAlgorithm {
+	
+	/**
+	* This method implements Kadane's Algorithm
+	* 
+    * @param arr The input array
+	* @return The maximum contiguous subarray sum of the array
+    * 
+    */
+	static int largestContiguousSum(int arr[]){
+		int i,len=arr.length,cursum=0,maxsum=Integer.MIN_VALUE;
+		if(len==0)	//empty array
+			return 0;
+		for(i=0;i<len;i++){
+			cursum+=arr[i];
+			if(cursum>maxsum){
+				maxsum=cursum;
+			}
+			if(cursum<=0){
+				cursum=0;
+			}
+		}
+		return maxsum;
+	}
+
+	/**
+	 * Main method
+	 * 
+	 * @param args Command line arguments
+	 */
+	public static void main(String[] args) {
+		Scanner sc=new Scanner(System.in);
+		int n,arr[],i;
+		n=sc.nextInt();
+		arr=new int[n];
+		for(i=0;i<n;i++){
+			arr[i]=sc.nextInt();
+		}
+		int maxContSum=largestContiguousSum(arr);
+		System.out.println(maxContSum);
+		sc.close();
+	}
+
+}
