stinky stack

src/FindPathsPls/FindPathsMatrix.java

@@ -13,14 +13,21 @@ public class FindPathsMatrix
                     {6, 7, 8, 10},
                     {2, 5, 2, 8}
             };
-    GetPaths(M1);
+    GetPaths(M1,3);
   }
-  public static void GetPaths(int[][] M)
+  public static void GetPaths(int[][] M, int length)
   {
-    int[][] output = MultiplyMatrix(M,M);
+    int count = 2;
+    int[][] output = M;
+    while(count <= length) {
+
+      output = MultiplyMatrix(output, M);
       assert output != null;
+      count++;
+    }
     for (int[] ints : output) System.out.println(Arrays.toString(ints));
 
+
   }
 
   public static int[][] MultiplyMatrix(int[][] M1, int[][] M2)

src/ScuffedLinkedList/linkedlist.java

@@ -1,68 +1,54 @@
 package ScuffedLinkedList;
 
-public class linkedlist
+public class linkedlist {
-{
     public node head;
     public node tail;
     public int size;
 
-    linkedlist()
+    linkedlist() {
-    {
         size = -1;
 
     }
 
-    linkedlist(int value)
+    linkedlist(int value) {
-    {
+        node inserted = new node(value);
-        node inserted =new node(value);
         this.head = inserted;
         this.tail = inserted;
+        head.prev = tail;
+        tail.next = head;
+
         size = 0;
     }
 
 
-    public node getNode(int index)
+    public node getNode(int index) {
-    {
 
-        if(index == 0)
+        if (index == 0)
             return head;
 
-        else if(index == size)
+        else if (index == size)
             return tail;
 
 
-        else if(index > size/2 && size > 10)
+         else
-        {
-            node current = tail;
-            for(int count = size; count > index-2; count--)
-                current = current.prev;
-            return current;
-        }
-
-        else if(index <= size/2 || size < 10)
          {
             node current = head;
-            for(int count = 0; count < index-1; count++)
+            for (int count = 0; count < index-1; count++)
                 current = current.next;
             return current;
         }
-        else
-            return null;
     }
 
 
-    public void add(int value, int index)
+    public void add(int value, int index) {
-    {
+        if (index == 0) {
-        if(index == 0)
-        {
             addFirst(value);
-        }
+        } else if (index == size) {
-        else if(index == size)
-        {
             addLast(value);
+
         }
-        else
+        else {
-        {
+
             node inserted = new node(value);
             node target = getNode(index);
 
@@ -73,48 +59,79 @@ public class linkedlist
         size++;
     }
 
-    public void addLast(int value)
+    public void addLast(int value) {
-    {
+
-        node target = tail;
         node inserted = new node(value);
 
-        target.next = inserted;
+        tail.next = inserted;
-        inserted.prev = target;
+        inserted.prev = tail;
+        inserted.next = head;
         tail = inserted;
+        head.prev = tail;
+        tail.next = head;
         size++;
     }
 
-    public void addFirst(int value)
+    public void addFirst(int value) {
-    {
         node target = head;
         node inserted = new node(value);
 
         target.prev = inserted;
+        inserted.prev = tail;
         inserted.next = target;
         head = inserted;
+        head.prev = tail;
+        tail.next = head;
         size++;
     }
 
 
-    public void delete(int index)
+    public void delete(int index) {
-    {
         node target = getNode(index);
-       node prev,next;
+        node prev, next;
 
         prev = target.prev;
         next = target.next;
 
-        if(prev == null)
+        if (prev == tail)
             head = next;
 
-        else if(next == null)
+        else if (next == head)
             tail = prev;
 
-        else
+        else {
-        {
             prev.next = next;
             next.prev = prev;
         }
         size--;
     }
+
+    public void spin2()
+    {
+        int count = 0;
+        while(count != 2)
+        {
+            node temp = head;
+            while(temp.next != head)
+            {
+                System.out.print(temp + " ");
+                temp = temp.next;
+            }
+            count++;
+        }
+    }
+    public void backwards()
+    {
+        int count = 0;
+        while(count != 2)
+        {
+            node temp = tail;
+            while(temp.prev != tail)
+            {
+                System.out.print(temp + " ");
+                temp = temp.prev;
+            }
+            count++;
+        }
+    }
 }

src/ScuffedLinkedList/linkedlistTest.java

@@ -31,4 +31,37 @@ class linkedlistTest
        L2.delete(L2.size);
 
     }
+
+    @Test
+    void spin2()
+    {
+        linkedlist L1 = new linkedlist(50);
+        L1.add(49,1);
+        L1.add(48,1);
+        L1.add(47,1);
+        L1.add(46,1);
+        L1.add(45,1);
+        L1.add(44,1);
+        L1.add(43,1);
+        L1.add(42,1);
+        L1.add(41,1);
+        L1.add(40,1);
+        L1.add(39,1);
+        L1.add(38,1);
+        L1.add(37,1);
+        L1.spin2();
+
+    }
+    @Test
+    void backwards()
+    {
+        linkedlist L1 = new linkedlist(50);
+        L1.addLast(49);
+        L1.addLast(48);
+        L1.addLast(47);
+        L1.addLast(46);
+        L1.addLast(45);
+        L1.backwards();
+
+    }
 }

src/ScuffedLinkedList/stinkyStack.java

@@ -0,0 +1,58 @@
+package ScuffedLinkedList;
+
+public class stinkyStack {
+    node top;
+    node head;
+
+
+    public void push(int value)
+    {
+        if(head == null)
+        {
+            head = new node(value);
+            top = head;
+        }
+        else
+        {
+            node inserted = new node(value);
+            top.next = inserted;
+            top = inserted;
+        }
+
+
+
+    }
+
+    public void pop() {
+        if (top == null)
+            System.out.println("Stack underflow");
+        else if (top == head) {
+            System.out.println(head);
+            head = null;
+            top = null;
+        } else {
+            node pointer = head;
+            System.out.println(top);
+            while (pointer.next != top) {
+                pointer = pointer.next;
+            }
+            pointer.next = null;
+            top = pointer;
+        }
+    }
+
+    public void display()
+    {
+        node pointer = head;
+        while(pointer != null)
+        {
+            System.out.println(pointer);
+            pointer = pointer.next;
+        }
+
+    }
+}
+
+
+
+

src/ScuffedLinkedList/stinkyStackTest.java

@@ -0,0 +1,47 @@
+package ScuffedLinkedList;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class stinkyStackTest {
+
+    @Test
+    void push()
+    {
+        stinkyStack stack = new stinkyStack();
+        stack.push(50);
+        assertEquals(50, stack.head.getValue());
+        assertEquals(50, stack.top.getValue());
+        stack.push(40);
+        assertEquals(50, stack.head.getValue());
+        assertEquals(40,stack.top.getValue());
+    }
+
+    @Test
+    void pop() {
+        stinkyStack stack = new stinkyStack();
+        stack.pop();
+        stack.push(10);
+        stack.push(20);
+        stack.push(30);
+        stack.push(50);
+        stack.pop();
+        stack.pop();
+        stack.pop();
+        stack.pop();
+        stack.pop();
+    }
+    @Test
+    void display()
+    {
+        stinkyStack stack = new stinkyStack();
+        stack.pop();
+        stack.push(10);
+        stack.push(20);
+        stack.push(30);
+        stack.push(50);
+        stack.display();
+
+    }
+}