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[Swift]LeetCode966.元音拼写检查器 | Vowel Spellchecker

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Given a wordlist, we want to implement a spellchecker that converts a query word into a correct word.

For a given query word, the spell checker handles two categories of spelling mistakes:

  • Capitalization: If the query matches a word in the wordlist (case-insensitive), then the query word is returned with the same case as the case in the wordlist.
    • Example: wordlist = ["yellow"], query = "YellOw": correct = "yellow"
    • Example: wordlist = ["Yellow"], query = "yellow": correct = "Yellow"
    • Example: wordlist = ["yellow"], query = "yellow": correct = "yellow"
  • Vowel Errors: If after replacing the vowels ('a', 'e', 'i', 'o', 'u') of the query word with any vowel individually, it matches a word in the wordlist (case-insensitive), then the query word is returned with the same case as the match in the wordlist.
    • Example: wordlist = ["YellOw"], query = "yollow": correct = "YellOw"
    • Example: wordlist = ["YellOw"], query = "yeellow": correct = "" (no match)
    • Example: wordlist = ["YellOw"], query = "yllw": correct = "" (no match)

In addition, the spell checker operates under the following precedence rules:

  • When the query exactly matches a word in the wordlist (case-sensitive), you should return the same word back.
  • When the query matches a word up to capitlization, you should return the first such match in the wordlist.
  • When the query matches a word up to vowel errors, you should return the first such match in the wordlist.
  • If the query has no matches in the wordlist, you should return the empty string.

Given some queries, return a list of words answer, where answer[i] is the correct word for query = queries[i].

Example 1:

Input: wordlist = ["KiTe","kite","hare","Hare"], queries = ["kite","Kite","KiTe","Hare","HARE","Hear","hear","keti","keet","keto"]
Output: ["kite","KiTe","KiTe","Hare","hare","","","KiTe","","KiTe"]

Note:

  • 1 <= wordlist.length <= 5000
  • 1 <= queries.length <= 5000
  • 1 <= wordlist[i].length <= 7
  • 1 <= queries[i].length <= 7
  • All strings in wordlist and queries consist only of english letters.

在给定单词列表 wordlist 的情况下，我们希望实现一个拼写检查器，将查询单词转换为正确的单词。

对于给定的查询单词 query，拼写检查器将会处理两类拼写错误：

  • 大小写：如果查询匹配单词列表中的某个单词（不区分大小写），则返回的正确单词与单词列表中的大小写相同。
    • 例如：wordlist = ["yellow"], query = "YellOw": correct = "yellow"
    • 例如：wordlist = ["Yellow"], query = "yellow": correct = "Yellow"
    • 例如：wordlist = ["yellow"], query = "yellow": correct = "yellow"
  • 元音错误：如果在将查询单词中的元音（‘a’、‘e’、‘i’、‘o’、‘u’）分别替换为任何元音后，能与单词列表中的单词匹配（不区分大小写），则返回的正确单词与单词列表中的匹配项大小写相同。
    • 例如：wordlist = ["YellOw"], query = "yollow": correct = "YellOw"
    • 例如：wordlist = ["YellOw"], query = "yeellow": correct = "" （无匹配项）
    • 例如：wordlist = ["YellOw"], query = "yllw": correct = "" （无匹配项）

此外，拼写检查器还按照以下优先级规则操作：

  • 当查询完全匹配单词列表中的某个单词（区分大小写）时，应返回相同的单词。
  • 当查询匹配到大小写问题的单词时，您应该返回单词列表中的第一个这样的匹配项。
  • 当查询匹配到元音错误的单词时，您应该返回单词列表中的第一个这样的匹配项。
  • 如果该查询在单词列表中没有匹配项，则应返回空字符串。

给出一些查询 queries，返回一个单词答案列表 answer，其中 answer[i] 是由查询 query = queries[i] 得到的正确单词。

 

示例：

输入：wordlist = ["KiTe","kite","hare","Hare"], queries = ["kite","Kite","KiTe","Hare","HARE","Hear","hear","keti","keet","keto"]
输出：["kite","KiTe","KiTe","Hare","hare","","","KiTe","","KiTe"]

提示：

  1. 1 <= wordlist.length <= 5000
  2. 1 <= queries.length <= 5000
  3. 1 <= wordlist[i].length <= 7
  4. 1 <= queries[i].length <= 7
  5. wordlist 和 queries 中的所有字符串仅由英文字母组成。

476ms

 1 class Solution {
 2     func spellchecker(_ wordlist: [String], _ queries: [String]) -> [String] {
 3         var ori:[String:String] = [String:String]()
 4         var lowerCase:[String:String] = [String:String]()
 5         var vowel:[String:String] = [String:String]()
 6         
 7         for i in 0..<wordlist.count
 8         {
 9             ori[wordlist[i]] = wordlist[i]
10             var lower:String = wordlist[i].lowercased()
11             if lowerCase[lower] == nil
12             {
13                 lowerCase[lower] = wordlist[i]
14             }
15             
16             var vowelString:String = changeVowel(wordlist[i])
17             if vowel[vowelString] == nil
18             {
19                 vowel[vowelString] = wordlist[i]
20             }
21         }
22         
23         var ans:[String] = [String](repeating:String(),count:queries.count)
24         for i in 0..<queries.count
25         {
26             if ori[queries[i]] != nil
27             {
28                 ans[i] = ori[queries[i]]!
29             }
30             else if lowerCase[queries[i].lowercased()] != nil
31             {
32                 ans[i] = lowerCase[queries[i].lowercased()]!
33             }
34             else if vowel[changeVowel(queries[i])] != nil
35             {
36                 ans[i] = vowel[changeVowel(queries[i])]!
37             }
38             else
39             {
40                 ans[i] = String()
41             }
42         }
43         return ans
44     }
45     
46     func changeVowel(_ s:String) -> String
47     {
48         var str:String = String()
49         var s = s.lowercased()
50         var vowels:Set<Character> = ["a","e","i","o","u"]
51         for i in 0..<s.count
52         {
53             var char:Character = s[i]
54             if vowels.contains(char)
55             {
56                 str.append("a")
57             }
58             else
59             {
60                 str.append(char)
61             }
62         }
63         return str
64     }
65 }
66 
67 extension String {        
68     //subscript函数可以检索数组中的值
69     //直接按照索引方式截取指定索引的字符
70     subscript (_ i: Int) -> Character {
71         //读取字符
72         get {return self[index(startIndex, offsetBy: i)]}
73     }
74 }

608ms

 1 class Solution {
 2     private func toVowelStr(_ str: String) -> String {
 3         let vowelChars = Set<Character>(["A","E","I","O","U"])
 4         let chars1 = Array(str.uppercased())
 5         var dstChars = [Character]()
 6         for c in chars1 {
 7             if vowelChars.contains(c) {
 8                 dstChars.append("A")
 9             }else {
10                 dstChars.append(c)
11             }
12         }
13         return String(dstChars)
14     }
15 
16     func spellchecker(_ wordlist: [String], _ queries: [String]) -> [String] {
17         var ans = [String]()
18         var mapWordlist = [String: Bool]()
19         var mapUpperWordlist = [String: String]()
20         var mapvowelWordlist = [String: String]()
21         wordlist.forEach { (str) in
22             mapWordlist[str] = true
23             let strs = mapUpperWordlist[str.uppercased()]
24             if strs == nil {
25                 mapUpperWordlist[str.uppercased()] = str
26             }
27             let vowelStr = toVowelStr(str)
28             let strs2 = mapvowelWordlist[vowelStr]
29             if strs2 == nil {
30                 mapvowelWordlist[vowelStr] = str
31             }
32         }
33 
34         for q in queries {
35             let exist = mapWordlist[q] ?? false
36             if exist {
37                 ans.append(q)
38                 continue
39             }
40 
41             let strs = mapUpperWordlist[q.uppercased()]
42             if strs != nil {
43                 ans.append(strs!)
44                 continue
45             }
46 
47             let vowelStrMap = mapvowelWordlist[toVowelStr(q)]
48             if vowelStrMap != nil {
49                 ans.append(vowelStrMap!)
50                 continue
51             }
52             ans.append("")
53         }
54         return ans
55     }
56 }

716ms

 1 extension Optional {
 2     func orElse(_ defaultElement: Wrapped) -> Wrapped {
 3         return self ?? defaultElement
 4     }
 5 }
 6 
 7 extension Sequence where Self.Element: Hashable {
 8     var frequencies: [Self.Element: Int] {
 9         var map: [Self.Element: Int] = [:]
10         forEach { (element) in
11             map[element] = map[element].orElse(0) + 1
12         }
13         return map
14     }
15 }
16 
17 class Solution {
18     func spellchecker(_ wordlist: [String], _ queries: [String]) -> [String] {
19         var exactMap: [String: [String]] = [:]
20         var capMap: [String: [String]] = [:]
21         var vowelMap: [String: [String]] = [:]
22         var res: [String] = []
23         
24         for word in wordlist {
25             exactMap[word] = exactMap[word].orElse([]) + [word]
26             capMap[word.lowercased()] = capMap[word.lowercased()].orElse([]) + [word]
27             vowelMap[conv(word.lowercased())] = vowelMap[conv(word.lowercased())].orElse([]) + [word]
28         }
29         
30         for query in queries {
31             if let words = exactMap[query], let word = words.first {
32                 res.append(word)
33             } else if let words = capMap[query.lowercased()], let word = words.first {
34                  res.append(word)
35             } else if let words = vowelMap[conv(query.lowercased())], let word = words.first {
36                 res.append(word)
37             } else {
38                 res.append("")
39             }
40         }
41             
42         return res
43     }
44     
45     func conv(_ s: String) -> String {
46         var res: [Character] = Array(s)
47         
48         for (i, symbol) in s.enumerated() {
49             if symbol == "a" || symbol == "e" || symbol == "i" || symbol == "o" || symbol == "u" {
50                res[i] = "1"
51             }
52         }
53         
54         return String(res)
55     }
56 }

732ms

 1 class Solution {
 2     func spellchecker(_ wordlist: [String], _ queries: [String]) -> [String] {
 3         var exactMap: [String: [String]] = [:]
 4         var capMap: [String: [String]] = [:]
 5         var vowelMap: [String: [String]] = [:]
 6         var res: [String] = []
 7         
 8         for word in wordlist {
 9             exactMap[word] = (exactMap[word] ?? []) + [word]
10             capMap[word.lowercased()] = (capMap[word.lowercased()] ?? []) + [word]
11             vowelMap[conv(word.lowercased())] = (vowelMap[conv(word.lowercased())] ?? []) + [word]
12         }
13         
14         for query in queries {
15             if let words = exactMap[query], let word = words.first {
16                 res.append(word)
17             } else if let words = capMap[query.lowercased()], let word = words.first {
18                  res.append(word)
19             } else if let words = vowelMap[conv(query.lowercased())], let word = words.first {
20                 res.append(word)
21             } else {
22                 res.append("")
23             }
24         }
25             
26         return res
27     }
28     
29     func conv(_ s: String) -> String {
30         var res: [Character] = Array(s)
31         
32         for (i, symbol) in s.enumerated() {
33             if symbol == "a" || symbol == "e" || symbol == "i" || symbol == "o" || symbol == "u" {
34                res[i] = "1"
35             }
36         }
37         
38         return String(res)
39     }
40 }

 

posted @ 2018-12-31 10:25  为敢技术  阅读(301)  评论(0)  编辑  收藏  举报