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【Css】 10亿个数字中，选取最小的10个

作者:乔一 / 发布于2015/9/11/ 917


	public class Test {
	 static Random random = new Random();
	
	 static class Node {
	 int value;
	 Node next;
	 Node pre;
	
	 public Node(int value) {
	 this.value = value;
	 }
	 }
	
	 static class Result {
	 Node head;
	 Node tail;
	 int length;
	
	 public Result(int length) {
	 this.length = length;
	 this.head = new Node(Integer.MAX_VALUE);
	 this.tail = new Node(Integer.MAX_VALUE);
	 Node temp = head;
	 for (; length > 2; length--) {
	 Node t = new Node(Integer.MAX_VALUE);
	 temp.next = t;
	 t.pre = temp;
	 temp = t;
	 }
	 temp.next = tail;
	 tail.pre = temp;
	 }
	 }
	
	 public static void main(String[] args) {
	 Result result = new Result(10);
	 long st = System.currentTimeMillis();
	 for (int i = 0; i < 1000000000; i++) {
	 int tempNum = random.nextInt(Integer.MAX_VALUE);
	 if (tempNum < result.head.value) {
	 Node tempNode = new Node(tempNum);
	 tempNode.next = result.head;
	 result.head.pre = tempNode;
	 result.head = tempNode;
	 result.tail = result.tail.pre;
	 result.tail.next = null;
	 } else if (tempNum < result.tail.value) {
	 Node currNode = result.tail;
	 while (currNode != null) {
	 if (currNode.value == tempNum) {
	 break;
	 } else if (tempNum > currNode.value) {
	 Node tempNode = new Node(tempNum);
	 Node nextNode = currNode.next;
	 currNode.next = tempNode;
	 tempNode.next = nextNode;
	 tempNode.pre = currNode;
	 nextNode.pre = tempNode;
	 result.tail = result.tail.pre;
	 result.tail.next = null;
	 break;
	 }
	 currNode = currNode.pre;
	 }
	 }
	 }
	 long et = System.currentTimeMillis();
	 Node cN = result.head;
	 while (cN != null) {
	 System.out.println(cN.value);
	 cN = cN.next;
	 }
	 System.out.println("用时:" + (et - st) + "ms");
	 }
	}

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