The gray code is a binary numeral system where two successive values differ in only one bit.
Given a non-negative integer n representing the total number of bits in the code, print the sequence of gray code. A gray code sequence must begin with 0.
For example, given n = 2, return [0,1,3,2]. Its gray code sequence is:
00 - 0
01 - 1
11 - 3
10 - 2
Note:
For a given n, a gray code sequence is not uniquely defined.
For example, [0,2,3,1] is also a valid gray code sequence according to the above definition.
解决这道题目关键在于了解格雷码的编码规则,什么是格雷码,可以参考之前的一篇有关[url=http://kickcode.iteye.com/admin/blogs/2266135]格雷码[/url]的介绍,这里不再赘述。实现代码如下:
Given a non-negative integer n representing the total number of bits in the code, print the sequence of gray code. A gray code sequence must begin with 0.
For example, given n = 2, return [0,1,3,2]. Its gray code sequence is:
00 - 0
01 - 1
11 - 3
10 - 2
Note:
For a given n, a gray code sequence is not uniquely defined.
For example, [0,2,3,1] is also a valid gray code sequence according to the above definition.
解决这道题目关键在于了解格雷码的编码规则,什么是格雷码,可以参考之前的一篇有关[url=http://kickcode.iteye.com/admin/blogs/2266135]格雷码[/url]的介绍,这里不再赘述。实现代码如下:
public class Solution {
public List<Integer> grayCode(int n) {
List<Integer> list = new ArrayList<Integer>();
list.add(0);
for(int i = 1; i <=n; i++) {
for(int j = list.size() - 1; j >=0; j--) {
list.add(list.get(j) + (int)Math.pow(2, i - 1));
}
}
return list;
}
}
本文介绍了一种生成格雷码序列的方法,通过递增位数的方式构造出格雷码序列。给出了一个具体的Java实现示例,该方法适用于任何非负整数位数的格雷码生成。
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