leet-code/src/main/java/leetcode/editor/cn/GrayCode.java
huangge1199@hotmail.com 205e317003 89:格雷编码
2021-05-18 21:46:00 +08:00

68 lines
1.8 KiB
Java
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//格雷编码是一个二进制数字系统,在该系统中,两个连续的数值仅有一个位数的差异。
//
// 给定一个代表编码总位数的非负整数 n打印其格雷编码序列。即使有多个不同答案你也只需要返回其中一种。
//
// 格雷编码序列必须以 0 开头。
//
//
//
// 示例 1:
//
// 输入: 2
//输出: [0,1,3,2]
//解释:
//00 - 0
//01 - 1
//11 - 3
//10 - 2
//
//对于给定的 n其格雷编码序列并不唯一。
//例如,[0,2,3,1] 也是一个有效的格雷编码序列。
//
//00 - 0
//10 - 2
//11 - 3
//01 - 1
//
// 示例 2:
//
// 输入: 0
//输出: [0]
//解释: 我们定义格雷编码序列必须以 0 开头。
//  给定编码总位数为 n 的格雷编码序列,其长度为 2n。当 n = 0 时,长度为 20 = 1。
//  因此,当 n = 0 时,其格雷编码序列为 [0]。
//
// Related Topics 回溯算法
// 👍 293 👎 0
package leetcode.editor.cn;
import java.util.ArrayList;
import java.util.List;
//89:格雷编码
public class GrayCode {
public static void main(String[] args) {
//测试代码
Solution solution = new GrayCode().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public List<Integer> grayCode(int n) {
List<Integer> result = new ArrayList<Integer>();
result.add(0);
int head = 1;
for (int i = 0; i < n; i++) {
for (int j = result.size() - 1; j >= 0; j--) {
result.add(head + result.get(j));
}
head <<= 1;
}
return result;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}