第一次作业

group14/676615845/algo/pom.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.mark</groupId>
+    <artifactId>algo</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+        </dependency>
+    </dependencies>
+</project>

group14/676615845/algo/src/main/java/algo/BinarySearch.java

@@ -0,0 +1,17 @@
+package algo;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * Created by mark on 17/2/23.
+ */
+public class BinarySearch {
+
+    public static int rank(int key, int[] a) {
+        List list = new ArrayList();
+        list = new LinkedList();
+        return -1;
+    }
+}

group14/676615845/algo/src/main/java/com/coding/basic/Array.java

@@ -0,0 +1,16 @@
+package com.coding.basic;
+
+import java.util.Arrays;
+
+/**
+ * Created by mark on 17/2/24.
+ */
+public class Array {
+
+    public static Object[] grow(Object[] src, int size) {
+        return Arrays.copyOf(src, src.length + size);
+//        Object[] target = new Object[src.length + size];
+//        System.arraycopy(src, 0, target, 0, src.length);
+
+    }
+}

group14/676615845/algo/src/main/java/com/coding/basic/ArrayList.java

@@ -0,0 +1,73 @@
+package com.coding.basic;
+
+public class ArrayList implements List {
+
+	private int size;  // ArrayList 中的实际元素个数
+	private Object[] elementData;
+
+    public ArrayList() {
+        size = 0;
+        elementData = new Object[100];
+    }
+
+    public void add(Object o){
+        if (size >= elementData.length) {
+            elementData = Array.grow(elementData, 100);
+        }
+        elementData[size++] = o;
+    }
+
+	public void add(int index, Object o){
+        if (size >= elementData.length) {
+            elementData = Array.grow(elementData, 100);
+        }
+
+        if (index > size || index < 0) throw new ArrayIndexOutOfBoundsException();
+
+        System.arraycopy(elementData, index, elementData, index + 1, size - index);
+        elementData[index] = o;
+        size++;
+    }
+
+	public Object get(int index){
+        if (index > size) throw new ArrayIndexOutOfBoundsException();
+        return elementData[index];
+    }
+
+	public Object remove(int index){
+
+        if (index >= size || index < 0) throw new ArrayIndexOutOfBoundsException();
+
+        Object result = elementData[index];
+        System.arraycopy(elementData, index + 1, elementData, index, size - index - 1);
+        elementData[--size] = null;
+        return result;
+    }
+
+	public int size() {
+		return size;
+	}
+
+	public Iterator iterator(){
+
+		return new Iterator() {
+
+            private int next = 0; // 下一个返回元素所在的位置
+
+            public boolean hasNext() {
+                return next < size;
+            }
+
+            public Object next() {
+                if (!hasNext()) throw new ArrayIndexOutOfBoundsException();
+                return elementData[next++];
+            }
+
+            public Object remove() {
+                if (next <= 0) throw new IllegalStateException();
+                return ArrayList.this.remove(--next);
+            }
+        };
+	}
+
+}

group14/676615845/algo/src/main/java/com/coding/basic/BinaryTreeNode.java

@@ -0,0 +1,41 @@
+package com.coding.basic;
+
+public class BinaryTreeNode implements Comparable {
+
+	private Object data;
+	private BinaryTreeNode left;
+	private BinaryTreeNode right;
+
+	public Object getData() {
+		return data;
+	}
+
+	public void setData(Object data) {
+		this.data = data;
+	}
+
+	public BinaryTreeNode getLeft() {
+		return left;
+	}
+
+	public void setLeft(BinaryTreeNode left) {
+		this.left = left;
+	}
+
+	public BinaryTreeNode getRight() {
+		return right;
+	}
+
+	public void setRight(BinaryTreeNode right) {
+		this.right = right;
+	}
+
+	public BinaryTreeNode insert(Object o){
+		return  null;
+	}
+
+	public int compareTo(Object obj) {
+		if (obj == null || obj.getClass() != Integer.class) throw new IllegalArgumentException();
+		return Integer.compare(((Integer) data).intValue(), ((Integer) obj).intValue());
+	}
+}

group14/676615845/algo/src/main/java/com/coding/basic/Iterator.java

@@ -0,0 +1,7 @@
+package com.coding.basic;
+
+public interface Iterator {
+	boolean hasNext();
+	Object next();
+	Object remove();
+}

group14/676615845/algo/src/main/java/com/coding/basic/LinkedList.java

@@ -0,0 +1,164 @@
+package com.coding.basic;
+
+public class LinkedList implements List {
+
+	private Node first = null;
+	private Node last = null;
+	private int size = 0;
+
+	public void add(Object o){
+		Node node = new Node(o);
+		if (first == null) {
+			first = node;
+		} else {
+			last.next = node;
+			node.prev = last;
+		}
+		last = node;
+		size++;
+	}
+
+	public void add(int index , Object o) {
+		if (index < 0 || index > size) throw new ArrayIndexOutOfBoundsException();
+
+		Node node = new Node(o);
+
+		if (first == null) {
+			first = node;
+			last = node;
+		} else {
+			if (index == 0) {
+				node.next = first;
+				first.prev = node;
+                first = node;
+			} else if (index == size) {
+				last.next = node;
+				node.prev = last;
+				last = node;
+			} else {
+				Node temp = first;
+				while (--index > 0) {
+					temp = temp.next;
+				}
+				node.next = temp.next;
+				temp.next.prev = node;
+				temp.next = node;
+				node.prev = temp;
+			}
+		}
+		size++;
+	}
+	public Object get(int index){
+		if (index < 0 || index > size - 1) throw new ArrayIndexOutOfBoundsException();
+		Node node = first;
+		while (index-- > 0) {
+			node = node.next;
+		}
+		return node.data;
+	}
+
+	public Object remove(int index){
+		if (index < 0 || index >= size) throw new ArrayIndexOutOfBoundsException();
+
+		Node node = null;
+		if (index == 0) {
+			node = first;
+			if (size == 1) {
+				first = null;
+				last = null;
+			} else {
+				first = first.next;
+				first.prev = null;
+			}
+		} else if (index == size - 1) {
+			node = last;
+			last = last.prev;
+			last.next = null;
+		} else {
+			node = first;
+			Node temp = null;
+			while (index-- > 0) {
+				node = node.next;
+			}
+			temp = node.prev;
+			temp.next = node.next;
+			node.next.prev = temp;
+		}
+		size--;
+		return node.data;
+	}
+
+	public int size(){
+		return size;
+	}
+
+	public void addFirst(Object obj){
+		add(0, obj);
+	}
+
+	public void addLast(Object obj){
+		add(size, obj);
+	}
+
+	public Object removeFirst(){
+		return remove(0);
+	}
+
+	public Object removeLast(){
+		return remove(size - 1);
+	}
+
+	public Iterator iterator(){
+
+		if (first == null || last == null) throw new IllegalStateException();
+
+		return new InnerIterator();
+	}
+
+	private class InnerIterator implements Iterator {
+
+		private Node nextNode = first;
+
+		public boolean hasNext() {
+			return nextNode != null;
+		}
+
+		public Object next() {
+			if (!hasNext()) throw new ArrayIndexOutOfBoundsException();
+			Node node = nextNode;
+			nextNode = nextNode.next;
+			return node.data;
+		}
+
+		public Object remove() {
+			if (nextNode == first) throw new IllegalStateException();
+
+			Node node = nextNode.prev;
+			if (nextNode == first.next) {
+				first = nextNode;
+				first.prev = null;
+			} else if (nextNode == null) {
+				node = last;
+				last = last.prev;
+				last.next = null;
+			} else {
+				node.prev = node.next;
+				node.next.prev = node.prev;
+			}
+			return node.data;
+		}
+	}
+
+	private static class Node{
+
+		Object data;
+		Node next;
+		Node prev;
+
+		public Node(Object data) {
+			this.data = data;
+			next = null;
+			prev = null;
+		}
+	}
+}

group14/676615845/algo/src/main/java/com/coding/basic/List.java

@@ -0,0 +1,9 @@
+package com.coding.basic;
+
+public interface List {
+	void add(Object o);
+	void add(int index, Object o);
+	Object get(int index);
+	Object remove(int index);
+	int size();
+}

group14/676615845/algo/src/main/java/com/coding/basic/Queue.java

@@ -0,0 +1,22 @@
+package com.coding.basic;
+
+public class Queue {
+
+	private LinkedList linkedList = new LinkedList();
+
+	public void enQueue(Object o){
+		linkedList.add(o);
+	}
+
+	public Object deQueue(){
+		return linkedList.removeFirst();
+	}
+
+	public boolean isEmpty(){
+		return linkedList.size() == 0;
+	}
+
+	public int size(){
+		return linkedList.size();
+	}
+}