Initial Commit

Submissions/As9/IsaacShoebottom_As9_Report/src/Sparse.java

@@ -0,0 +1,96 @@
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.Scanner;
+
+public class Sparse {
+    private Node head;
+
+    Sparse(String file) {
+        try {
+            readList(file);
+        } catch (FileNotFoundException exception) {
+            System.err.println("File not found");
+        }
+    }
+
+    private void readList(String filename) throws FileNotFoundException {
+        File file = new File(filename);
+        Scanner sc = new Scanner(file);
+        while (sc.hasNextLine()){
+            long index = sc.nextLong();
+            long value = sc.nextLong();
+            insertValue(index, value);
+            if (sc.hasNextLine())
+                sc.nextLine();
+        }
+    }
+
+    public void mergeLists(Sparse other) {
+        Node headNode = other.head;
+        while (headNode != null) {
+            insertValue(headNode.index, headNode.value);
+            headNode = headNode.next;
+        }
+    }
+
+    private void insertValue(long index, long value) {
+        if (head == null) {
+            head = new Node(index, value);
+        }
+        else {
+            Node nextNode = head;
+            Node lastNode = head;
+            if (value == 0)
+                return;
+            while (nextNode != null && nextNode.index < index) {
+                lastNode = nextNode;
+                nextNode = nextNode.next;
+            }
+            if (nextNode != null && nextNode.index == index) {
+                nextNode.value += value;
+                if (nextNode.value == 0) {
+                    lastNode.next = nextNode.next;
+                }
+            }
+            else {
+                Node insertedNode = new Node(index, value);
+                insertedNode.next = lastNode.next;
+                lastNode.next = insertedNode;
+            }
+
+        }
+    }
+
+    private void printRecR(Node node) {
+        if (node != null) {
+            System.out.println(node.index + " : " + node.value);
+            printRecR(node.next);
+        }
+    }
+
+    public void printRec() {
+        printRecR(head);
+    }
+
+    private void printRecBackwardsR(Node node) {
+        if (node != null) {
+            printRecBackwardsR(node.next);
+            System.out.println(node.index + " : " + node.value);
+        }
+    }
+
+    public void printRecBackwards() {
+        printRecBackwardsR(head);
+    }
+
+    private static class Node {
+        long index;
+        long value;
+        Node next;
+        Node(long index, long value) {
+            this.index = index;
+            this.value = value;
+            this.next = null;
+        }
+    }
+}

Submissions/As9/IsaacShoebottom_As9_Report/src/TestSparse.java

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+public class TestSparse {
+    public static void main(String[] args) {
+        Sparse sparse1 = new Sparse(args[0]);
+        Sparse sparse2 = new Sparse(args[1]);
+
+        sparse1.mergeLists(sparse2);
+        sparse1.printRec();
+        System.out.println("now backwards:");
+        sparse1.printRecBackwards();
+    }
+}

Submissions/As9/IsaacShoebottom_As9_Report/tests/test1a.in

@@ -0,0 +1,4 @@
+0 6
+12 36
+25 2
+316 18

Submissions/As9/IsaacShoebottom_As9_Report/tests/test1b.in

@@ -0,0 +1,4 @@
+5 13
+12 4
+25 -2
+55 -3

Submissions/As9/IsaacShoebottom_As9_Report/tests/test2a.in

@@ -0,0 +1,6 @@
+0 6
+0 8
+9090 7
+12 36
+25 2
+316 18

Submissions/As9/IsaacShoebottom_As9_Report/tests/test2b.in

@@ -0,0 +1,6 @@
+5 13
+12 4
+25 -2
+55 -3
+0 0
+0 7