modify

archimonda · Jun 2, 2019 · 4ae3a1f · 4ae3a1f
1 parent 168273e
commit 4ae3a1f
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/0014-最长公共前缀/Swift/LongestCommonPrefix.swift b/0014-最长公共前缀/Swift/LongestCommonPrefix.swift
@@ -6,14 +6,15 @@ class LongestCommonPrefix {
     func longestCommonPrefix(_ strs: [String]) -> String {
         var longestPrefix = [Character](), index = 0
 
-        guard let firstStr = strs.first else {
+        guard let _ = strs.first else {
             return String(longestPrefix)
         }
 
-        let firstStrChars = Array(firstStr)
         let strsChars = strs.map { Array($0) }
 
-        while index < firstStr.count {
+        let firstStrChars = strsChars.first!
+
+        while index < firstStrChars.count {
 
             longestPrefix.append(firstStrChars[index])