问题描述:

十个猴子围成一圈选大王,依次1-3 循环报数,报到3 的猴子被淘汰,直到最后一只猴子成为大王。问,哪只猴子最后能成为大王?

方法一:Java链表

public class TestAll {

static Scanner scanner = new Scanner(System.in);

static int num;

static String str;

static LinkedList<String> list = new LinkedList<String>();

static LinkedList<String> result = new LinkedList<String>();

public static void main(String[] arg) {

input();

output();

}

private static void output() {

pushNum();

Iterator it = result.iterator();

while (it.hasNext()) {

System.out.print(it.next() + " ");

}

}

private static void pushNum() {

int i = 1;

while (list.size() > 0) {

// System.out.println(i+"!! ");

Iterator it = list.iterator();

while (it.hasNext()) {

String node = (String) it.next();

if (i == num) {

result.add(node);

it.remove();

i = 0;

}

i++;

}

}

}

private static void input() {

str = scanner.nextLine();

String[] tmp = str.split(" ");

num = Integer.parseInt(tmp[0]);

for (int i = 1; i < tmp.length; i++) {

list.add(tmp[i]);

}

}

}

方法二:数组

public class TimeTest {

public static void main(String[] args) {

int num = 10;

boolean[] array = new boolean[num];

for (int i = 0; i < num; i++) {

array[i] = true;

}

int index = 0;

int count = 0;

int n = num;

while (n > 1) {

if (array[index] == true) {

count++;

if (count == 3)

// 当count等于3时,就淘汰一个;

{

array[index] = false;

n--; // 当有一个被淘汰时,n--;

count = 0;

}

}

index++;

// 当从0循环到29时,重新置index为0;

if (index == num) {

index = 0;

}

}

for (int i = 0; i < num; i++) {

if (array[i] == true)

System.out.println(i + 1);

}

}

}

 其中方法一的时间复杂度为O(n^2)

方法二的时间复杂度为O(n)