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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 <= str1.length == str2.length <= 10^4
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 str2
。htm
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 <= str1.length == str2.length <= 10^4
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 }