Solution Longest substring without repeating characters

Author: doitduri

longest-substring-without-repeating-characters/doitduri.swift

@@ -0,0 +1,20 @@
+class Solution {
+    func lengthOfLongestSubstring(_ s: String) -> Int {
+        var charIndexMap = [Character: Int]()
+        var maxLength = 0
+        var startIndex = 0
+        
+        for (i, char) in Array(s).enumerated() {
+            if let lastIndex = charIndexMap[char], lastIndex >= startIndex {
+                startIndex = lastIndex + 1
+            }
+            
+            let currentLength = i - startIndex + 1
+            maxLength = max(maxLength, currentLength)
+            
+            charIndexMap[char] = i
+        }
+        
+        return maxLength
+    }
+}