题目

国际摩尔斯密码定义一种标准编码方式,将每个字母对应于一个由一系列点和短线组成的字符串, 比如: "a" 对应 ".-""b" 对应 "-...""c" 对应 "-.-.", 等等。

为了方便,所有26个英文字母对应摩尔斯密码表如下:

[".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."]

给定一个单词列表,每个单词可以写成每个字母对应摩尔斯密码的组合。例如,"cab" 可以写成 "-.-..--...",(即 "-.-." + "-..." + ".-"字符串的结合)。我们将这样一个连接过程称作单词翻译。

返回我们可以获得所有词不同单词翻译的数量。

例如:
输入: words = ["gin", "zen", "gig", "msg"]
输出: 2
解释:
各单词翻译如下:
"gin" -> "--...-."
"zen" -> "--...-."
"gig" -> "--...--."
"msg" -> "--...--." 共有 2 种不同翻译, "--...-." 和 "--...--.".

注意:

  • 单词列表words 的长度不会超过 100
  • 每个单词 words[i]的长度范围为 [1, 12]
  • 每个单词 words[i]只包含小写字母。

考点

1.无序关联容器set的唯一性,关键字等于值。

2. set.insert(key);


思路

无序关联容器set不重复,关键字类型string。循环:顺序容器里的每个单词。再循环:求出每一个单词的摩斯码,t+=morse[c-'a'],翻译字符,插入关联容器中,可以去除重复。


代码

class Solution {
public:
int uniqueMorseRepresentations(vector<string>& words) {
vector<string> morse{".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."};
unordered_set<string> s;
for(string word:words)
{
string t="";
for(char c:word)
{
t+=morse[c-'a'];
}
s.insert(t);
} return s.size();
}
};

问题

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