[Swift]LeetCode1153. 字符串轉化 | String Transforms Into Another String

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Given two strings str1 and str2 of the same length, determine whether you can transform str1 into str2 by doing zero or more conversions.git

In one conversion you can convert all occurrences of one character in str1 to any other lowercase English character.github

Return true if and only if you can transform str1 into str2.微信

Example 1:spa

Input: str1 = "aabcc", str2 = "ccdee" Output: true Explanation: Convert 'c' to 'e' then 'b' to 'd' then 'a' to 'c'. Note that the order of conversions matter. 

Example 2:code

Input: str1 = "leetcode", str2 = "codeleet" Output: false Explanation: There is no way to transform str1 to str2.

Note:orm

  1. 1 <= str1.length == str2.length <= 10^4
  2. Both str1 and str2 contain only lowercase English letters.

給出兩個長度相同的字符串,分別是 str1 和 str2。請你幫忙判斷字符串 str1 能不能在 零次 或 屢次 轉化後變成字符串 str2htm

每一次轉化時,將會一次性將 str1 中出現的 全部 相同字母變成其餘 任何 小寫英文字母(見示例)。blog

只有在字符串 str1 可以經過上述方式順利轉化爲字符串 str2 時才能返回 True,不然返回 False。​​ci

示例 1:

輸入:str1 = "aabcc", str2 = "ccdee"
輸出:true
解釋:將 'c' 變成 'e',而後把 'b' 變成 'd',接着再把 'a' 變成 'c'。注意,轉化的順序也很重要。

示例 2:

輸入:str1 = "leetcode", str2 = "codeleet"
輸出:false
解釋:咱們沒有辦法可以把 str1 轉化爲 str2。

提示:

  1. 1 <= str1.length == str2.length <= 10^4
  2. str1 和 str2 中都只會出現 小寫英文字母

72ms

 1 class Solution {
 2     func canConvert(_ str1: String, _ str2: String) -> Bool {
 3         if str1 == str2 {return true}
 4         let n:Int = str1.count
 5         var arr:[Int] = [Int](repeating:-1,count:26)
 6         let arrS:[Int] = Array(str1).map{$0.ascii}
 7         let arrT:[Int] = Array(str2).map{$0.ascii}
 8         for i in 0..<n
 9         {
10             var x:Int = arrS[i] - 97
11             var y:Int = arrT[i] - 97
12             if arr[x] == -1
13             {
14                 arr[x] = y
15             }
16             else if arr[x] != y
17             {
18                 return false
19             }
20         }
21         var has:Int = 0
22         for i in 0..<26
23         {
24             if arr[i] != -1
25             {
26                 has += 1
27             }            
28         }
29         var flag:Int = 0
30         for i in 0..<26
31         {
32             for j in (i + 1)..<26
33             {
34                 if arr[i] != -1 && arr[j] != -1 && arr[i] == arr[j]
35                 {
36                     flag = 1
37                 }
38             }
39         }
40         if has != 26 || flag != 0 {return true}
41         return false
42     }
43 }
44 
45 //Character擴展 
46 extension Character  
47 {  
48   //Character轉ASCII整數值(定義小寫爲整數值)
49    var ascii: Int {
50        get {
51            return Int(self.unicodeScalars.first?.value ?? 0)
52        }       
53     }
54 }
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