diff --git a/izzivi/.idea/inspectionProfiles/Project_Default.xml b/izzivi/.idea/inspectionProfiles/Project_Default.xml
index 581c216..5f2e5cd 100644
--- a/izzivi/.idea/inspectionProfiles/Project_Default.xml
+++ b/izzivi/.idea/inspectionProfiles/Project_Default.xml
@@ -8,5 +8,6 @@
         </list>
       </option>
     </inspection_tool>
+    <inspection_tool class="RawUseOfParameterizedType" enabled="false" level="WARNING" enabled_by_default="false" />
   </profile>
 </component>
\ No newline at end of file
diff --git a/izzivi/src/izziv4/Izziv4.java b/izzivi/src/izziv4/Izziv4.java
new file mode 100644
index 0000000..6a4bfa1
--- /dev/null
+++ b/izzivi/src/izziv4/Izziv4.java
@@ -0,0 +1,400 @@
+package izziv4;
+
+class CollectionException extends Exception {
+    public CollectionException(String msg) {
+        super(msg);
+    }
+}
+
+interface Collection {
+    static final String ERR_MSG_EMPTY = "Collection is empty.";
+
+    boolean isEmpty();
+
+    int size();
+
+    String toString();
+}
+
+interface Queue<T> extends Collection {
+    T front() throws CollectionException;
+
+    void enqueue(T x);
+
+    T dequeue() throws CollectionException;
+}
+
+interface PriorityQueue<T extends Comparable> extends Queue<T> {
+}
+
+@SuppressWarnings("ALL")
+class ArrayPQ<T extends Comparable> implements PriorityQueue<T> {
+    T[] array = (T[]) new Comparable[64];
+    int size = 0;
+    int moves = 0;
+    int compares = 0;
+
+    void resize() {
+        T[] newArray = (T[]) new Comparable[array.length * 2];
+        System.arraycopy(array, 0, newArray, 0, array.length);
+        array = newArray;
+    }
+
+    @Override
+    public T front() throws CollectionException {
+        if (isEmpty()) {
+            throw new CollectionException(ERR_MSG_EMPTY);
+        }
+        T max = array[0];
+        for (int i = 0; i < size; i++) {
+            compares++;
+            if (array[i].compareTo(max) > 0) {
+                max = array[i];
+            }
+        }
+        return max;
+    }
+
+    @Override
+    public void enqueue(T x) {
+        if (size == array.length) {
+            resize();
+        }
+        moves++;
+        array[size++] = x;
+    }
+
+    @Override
+    public T dequeue() throws CollectionException {
+        if (isEmpty()) {
+            throw new CollectionException(ERR_MSG_EMPTY);
+        }
+        T max = array[0];
+        int maxIndex = 0;
+        for (int i = 0; i < size; i++) {
+            compares++;
+            if (array[i].compareTo(max) > 0) {
+                max = array[i];
+                maxIndex = i;
+            }
+        }
+
+        for (int i = maxIndex; i < size - 1; i++) {
+            array[i] = array[i + 1];
+            moves++;
+        }
+        size--;
+
+        return max;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return size == 0;
+    }
+
+    @Override
+    public int size() {
+        return size;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("[");
+        if (size > 0) {
+            sb.append(array[0]);
+            for (int i = 1; i < size; i++) {
+                sb.append(", " + array[i]);
+            }
+        }
+        sb.append("]");
+        return sb.toString();
+    }
+}
+
+@SuppressWarnings("ALL")
+class ArrayHeapPQ<T extends Comparable> implements PriorityQueue<T> {
+    T[] array = (T[]) new Comparable[64];
+    int size = 0;
+    int moves = 0;
+    int compares = 0;
+
+    void resize() {
+        T[] newArray = (T[]) new Comparable[array.length * 2];
+        System.arraycopy(array, 0, newArray, 0, array.length);
+        array = newArray;
+    }
+
+    @Override
+    public T front() throws CollectionException {
+        if (isEmpty()) {
+            throw new CollectionException(ERR_MSG_EMPTY);
+        }
+        return array[0];
+    }
+
+    @Override
+    public void enqueue(T x) {
+        if (size == array.length) {
+            resize();
+        }
+        int i = size;
+        array[i] = x;
+        size++;
+
+        while (true) {
+            int p = (i - 1) / 2;
+            compares++;
+            if (array[i].compareTo(array[p]) <= 0) {
+                break;
+            }
+            T tmp = array[i];
+            array[i] = array[p];
+            array[p] = tmp;
+            i = p;
+            moves += 3;
+        }
+    }
+
+    @Override
+    public T dequeue() throws CollectionException {
+        if (isEmpty()) {
+            throw new CollectionException(ERR_MSG_EMPTY);
+        }
+        T root = array[0];
+
+        array[0] = array[size - 1];
+        array[size - 1] = root;
+        moves += 2;
+        size--;
+
+        int i = 0;
+        while (true) {
+            int c = 2 * i + 1;
+            if (c >= size) break;
+
+            int c2 = 2 * i + 2;
+            compares++;
+            if (c2 < size && array[c2].compareTo(array[c]) > 0) {
+                c = c2;
+            }
+
+            compares++;
+            if (array[c].compareTo(array[i]) < 0) break;
+
+            T tmp = array[i];
+            array[i] = array[c];
+            array[c] = tmp;
+            moves += 3;
+            i = c;
+        }
+
+        return root;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return size == 0;
+    }
+
+    @Override
+    public int size() {
+        return size;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("[");
+        if (size > 0) {
+            sb.append(array[0]);
+            for (int i = 1; i < size; i++) {
+                sb.append(", " + array[i]);
+            }
+        }
+        sb.append("]");
+        return sb.toString();
+    }
+}
+
+class Node<T extends Comparable> {
+    T value;
+    Node<T> left;
+    Node<T> right;
+    Node<T> parent;
+
+    Node(T value) {
+        this.value = value;
+    }
+}
+
+@SuppressWarnings("ALL")
+class LinkedHeapPQ<T extends Comparable> implements PriorityQueue<T> {
+    Node<T> root = null;
+    int size = 0;
+    int moves = 0;
+    int compares = 0;
+
+    Node<T> getNode(int index) {
+        if (index == 0) {
+            return root;
+        }
+        Node parent = getNode((index - 1) / 2);
+        return index % 2 == 0 ? parent.right : parent.left;
+    }
+
+    @Override
+    public T front() throws CollectionException {
+        if (isEmpty()) {
+            throw new CollectionException(ERR_MSG_EMPTY);
+        }
+        return root.value;
+    }
+
+    @Override
+    public void enqueue(T x) {
+        Node<T> newNode = new Node(x);
+        if (isEmpty()) {
+            root = newNode;
+            size++;
+            moves++;
+            return;
+        }
+
+        int parentIndex = (size - 1) / 2;
+        Node<T> parent = getNode(parentIndex);
+        newNode.parent = parent;
+        if (size % 2 == 0) {
+            parent.right = newNode;
+        } else {
+            parent.left = newNode;
+        }
+        size++;
+
+        do {
+            compares++;
+            if (newNode.value.compareTo(newNode.parent.value) < 0) {
+                break;
+            }
+
+            T tmp = newNode.value;
+            newNode.value = newNode.parent.value;
+            newNode.parent.value = tmp;
+            newNode = newNode.parent;
+            moves += 3;
+        } while (newNode.parent != null);
+    }
+
+    @Override
+    public T dequeue() throws CollectionException {
+        T value = root.value;
+
+        int lastIndex = size - 1;
+        Node<T> last = getNode(lastIndex);
+        if (last == root) {
+            root = null;
+            size = 0;
+            moves++;
+            return value;
+        }
+
+        root.value = last.value;
+        if (lastIndex % 2 == 0) {
+            last.parent.right = null;
+        } else {
+            last.parent.left = null;
+        }
+        size--;
+
+        Node<T> node = root;
+        while (true) {
+            if (node.left == null) break;
+            Node<T> child = node.left;
+            compares++;
+            if (node.right != null) {
+                compares++;
+                if (node.left.value.compareTo(node.right.value) < 0) {
+                    child = node.right;
+                }
+            }
+
+            compares++;
+            if (node.value.compareTo(child.value) > 0) break;
+
+            T tmp = child.value;
+            child.value = node.value;
+            node.value = tmp;
+            node = child;
+            moves += 3;
+        }
+
+        return value;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return size == 0;
+    }
+
+    @Override
+    public int size() {
+        return size;
+    }
+}
+
+@SuppressWarnings("ALL")
+public class Izziv4 {
+    public static void main(String[] args) throws CollectionException {
+        System.out.println("Objekti: Integer");
+        System.out.println("Operacije: 10000 enqueue + 10000 (dequeue+enqueue+front)");
+        System.out.println();
+        System.out.println("Implementacija      Čas [ms]    Premikov    Primerjav");
+        System.out.println("------------------------------------------------------------");
+
+        long start = System.nanoTime();
+        ArrayPQ<Integer> arrayPQ = new ArrayPQ<>();
+        for (int i = 0; i < 10000; i++) {
+            arrayPQ.enqueue((int) (Math.random() * 10000));
+        }
+        for (int i = 0; i < 10000; i++) {
+            arrayPQ.dequeue();
+            arrayPQ.enqueue((int) (Math.random() * 10000));
+            arrayPQ.front();
+        }
+        long end = System.nanoTime();
+
+        System.out.println("Neurejeno polje     " + (end - start) / 1000000 + "         " + arrayPQ.moves + "    " + arrayPQ.compares);
+
+
+        start = System.nanoTime();
+        ArrayHeapPQ<Integer> arrayHeapPQ = new ArrayHeapPQ<>();
+        for (int i = 0; i < 10000; i++) {
+            arrayHeapPQ.enqueue((int) (Math.random() * 10000));
+        }
+        for (int i = 0; i < 10000; i++) {
+            arrayHeapPQ.dequeue();
+            arrayHeapPQ.enqueue((int) (Math.random() * 10000));
+            arrayHeapPQ.front();
+        }
+        end = System.nanoTime();
+
+        System.out.println("Implicitna kopica   " + (end - start) / 1000000 + "           " + arrayHeapPQ.moves + "      " + arrayHeapPQ.compares);
+
+
+        start = System.nanoTime();
+        LinkedHeapPQ<Integer> linkedHeapPQ = new LinkedHeapPQ<>();
+        for (int i = 0; i < 10000; i++) {
+            linkedHeapPQ.enqueue((int) (Math.random() * 10000));
+        }
+        for (int i = 0; i < 10000; i++) {
+            linkedHeapPQ.dequeue();
+            linkedHeapPQ.enqueue((int) (Math.random() * 10000));
+            linkedHeapPQ.front();
+        }
+        end = System.nanoTime();
+
+        System.out.println("Eksplicitna kopica  " + (end - start) / 1000000 + "           " + linkedHeapPQ.moves + "      " + linkedHeapPQ.compares);
+    }
+}
+
diff --git a/izzivi/src/izziv4/rezultati.png b/izzivi/src/izziv4/rezultati.png
new file mode 100644
index 0000000..5df40ec
Binary files /dev/null and b/izzivi/src/izziv4/rezultati.png differ