Initial data commit

Task/Greatest-subsequential-sum/Java/greatest-subsequential-sum-1.java

@@ -0,0 +1,57 @@
+import java.util.Scanner;
+import java.util.ArrayList;
+
+public class Sub{
+    private static int[] indices;
+
+    public static void main(String[] args){
+        ArrayList<Long> array= new ArrayList<Long>(); //the main set
+        Scanner in = new Scanner(System.in);
+        while(in.hasNextLong()) array.add(in.nextLong());
+        long highSum= Long.MIN_VALUE;//start the sum at the lowest possible value
+        ArrayList<Long> highSet= new ArrayList<Long>();
+        //loop through all possible subarray sizes including 0
+        for(int subSize= 0;subSize<= array.size();subSize++){
+            indices= new int[subSize];
+            for(int i= 0;i< subSize;i++) indices[i]= i;
+            do{
+                long sum= 0;//this subarray sum variable
+                ArrayList<Long> temp= new ArrayList<Long>();//this subarray
+                //sum it and save it
+                for(long index:indices) {sum+= array.get(index); temp.add(array.get(index));}
+                if(sum > highSum){//if we found a higher sum
+                    highSet= temp;    //keep track of it
+                    highSum= sum;
+                }
+            }while(nextIndices(array));//while we haven't tested all subarrays
+        }
+        System.out.println("Sum: " + highSum + "\nSet: " +
+        		highSet);
+    }
+    /**
+     * Computes the next set of choices from the previous. The
+     * algorithm tries to increment the index of the final choice
+     * first. Should that fail (index goes out of bounds), it
+     * tries to increment the next-to-the-last index, and resets
+     * the last index to one more than the next-to-the-last.
+     * Should this fail the algorithm keeps starting at an earlier
+     * choice until it runs off the start of the choice list without
+     * Finding a legal set of indices for all the choices.
+     *
+     * @return true unless all choice sets have been exhausted.
+     * @author James Heliotis
+     */
+
+    private static boolean nextIndices(ArrayList<Long> a) {
+        for(int i= indices.length-1;i >= 0;--i){
+            indices[i]++;
+            for(int j=i+1;j < indices.length;++j){
+                indices[j]= indices[j - 1] + 1;//reset the last failed try
+            }
+            if(indices[indices.length - 1] < a.size()){//if this try went out of bounds
+                return true;
+            }
+        }
+        return false;
+    }
+}