【Leetcode】804. Unique Morse Code Words
2024-09-04 10:20:50
Unique Morse Code Words
Description
International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follows: "a" maps to ".-", "b" maps to "-...", "c" maps to "-.-.", and so on.
For convenience, the full table for the 26 letters of the English alphabet is given below:
[".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."]
Now, given a list of words, each word can be written as a concatenation of the Morse code of each letter. For example, "cab" can be written as "-.-.-....-", (which is the concatenation "-.-." + "-..." + ".-"). We'll call such a concatenation, the transformation of a word.
Return the number of different transformations among all words we have.
Example:
Input: words = ["gin", "zen", "gig", "msg"]
Output: 2
Explanation:
The transformation of each word is:
"gin" -> "--...-."
"zen" -> "--...-."
"gig" -> "--...--."
"msg" -> "--...--."
There are 2 different transformations, "--...-." and "--...--.".
Note
- The length of words will be at most 100.
- Each words[i] will have length in range [1, 12].
- words[i] will only consist of lowercase letters.
Discuss
把字母对应的字符串存起来,一次遍历每一个单词,然后去重就可以了。
Code
class Solution {
public int uniqueMorseRepresentations(String[] words) {
List<String> list = Arrays.asList(".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..",
"--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--..");
Map<Integer, String> map = new HashMap<>();
int ans = 0;
for (int i = 97; i <= 122; i++) {
map.put(i, list.get(ans++));
}
Set<String> set = new HashSet<>();
for (int i = 0; i < words.length; i++) {
StringBuilder sb = new StringBuilder();
for (int j = 0; j < words[i].length(); j++) {
sb.append(map.get(Integer.valueOf(words[i].charAt(j))));
}
set.add(sb.toString());
}
return set.size();
}
}
最新文章
- Memento(备忘录)-对象行为型模式
- 图解集合3:CopyOnWriteArrayList
- Js位置与大小(1)&mdash;&mdash;正确理解和运用与尺寸大小相关的DOM属性
- C#中Attribute的继承
- jquery 中$.post获取MVC Controller中JsonResult返回包含LIst<;Model>;类型的子List<;Model>;的高级使用方法
- (转)Ubuntu 12.04 LTS 构建高可用分布式 MySQL 集群
- tableview 编辑状态设置
- STL_set&;multiset
- 哥德尔,图灵和康托尔 part 2 停机问题
- 使用diff和patch指令生成文件差异和还原文件
- vSphere Client 搭建Windows server 2008 r2 服务器指南
- 20170319 - pycurl 提示 libcurl link-time version is older than compile-time version
- 软件工程(GZSD2015)学生博客列表
- Python replace
- wamp设置本地访问路径为a.com
- Vivaldi浏览器媲美Chrome
- java mysql大数据量批量插入与流式读取分析
- 用面向对象的编程方式实现飞机大战小游戏,java版
- jQuery-对标签的样式操作
- jquery.validate1.9.0前台验证使用