Committing KadanesAlgo.java

KadanesAlgo.java

@@ -0,0 +1,38 @@
+class KadanesAlgo
+{
+    // Function to find the maximum sum of a contiguous subarray
+    // in a given integer array
+    public static int kadane(int[] A)
+    {
+        // stores the maximum sum subarray found so far
+        int maxSoFar = 0;
+
+        // stores the maximum sum of subarray ending at the current position
+        int maxEndingHere = 0;
+
+        // traverse the given array
+        for (int i: A)
+        {
+            // update the maximum sum of subarray "ending" at index `i` (by adding the
+            // current element to maximum sum ending at previous index `i-1`)
+            maxEndingHere = maxEndingHere + i;
+
+            // if the maximum sum is negative, set it to 0 (which represents
+            // an empty subarray)
+            maxEndingHere = Integer.max(maxEndingHere, 0);
+
+            // update the result if the current subarray sum is found to be greater
+            maxSoFar = Integer.max(maxSoFar, maxEndingHere);
+        }
+
+        return maxSoFar;
+    }
+
+    public static void main(String[] args)
+    {
+        int[] A = { -2, 1, -3, 4, -1, 2, 1, -5, 4 };
+
+        System.out.println("The sum of contiguous subarray with the " +
+                            "largest sum is " + kadane(A));
+    }
+}