diff --git a/Sources/Solutions/003 - Longest Substring Without Repeating Characters/LongestSubstringWithoutRepeatingCharactersBruteForceSolution.swift b/Sources/Solutions/003 - Longest Substring Without Repeating Characters/LongestSubstringWithoutRepeatingCharactersBruteForceSolution.swift
new file mode 100644
index 0000000..b99329e
--- /dev/null
+++ b/Sources/Solutions/003 - Longest Substring Without Repeating Characters/LongestSubstringWithoutRepeatingCharactersBruteForceSolution.swift	
@@ -0,0 +1,31 @@
+//
+//  LongestSubstringWithoutRepeatingCharactersBruteForceSolution.swift
+//  LeetSwift
+//
+//  Created by Jobert on 10/07/2024.
+//
+
+import Core
+import Foundation
+import Problems
+
+final class LongestSubstringWithoutRepeatingCharactersBruteForceSolution: LongestSubstringWithoutRepeatingCharactersDefinition {
+    
+    func lengthOfLongestSubstring(_ s: String) -> Int {
+        let chars = Array(s)
+        var maxLength = 0
+        
+        for i in 0..<chars.count {
+            var seen = Set<Character>()
+            for j in i..<chars.count {
+                if seen.contains(chars[j]) {
+                    break
+                }
+                seen.insert(chars[j])
+                maxLength = max(maxLength, j - i + 1)
+            }
+        }
+        
+        return maxLength
+    }
+}
diff --git a/Sources/Solutions/003 - Longest Substring Without Repeating Characters/LongestSubstringWithoutRepeatingCharactersSolution.swift b/Sources/Solutions/003 - Longest Substring Without Repeating Characters/LongestSubstringWithoutRepeatingCharactersSolution.swift
deleted file mode 100644
index 292d31f..0000000
--- a/Sources/Solutions/003 - Longest Substring Without Repeating Characters/LongestSubstringWithoutRepeatingCharactersSolution.swift	
+++ /dev/null
@@ -1,17 +0,0 @@
-//
-//  LongestSubstringWithoutRepeatingCharactersSolution.swift
-//  LeetSwift
-//
-//  Created by Jobert on 10/07/2024.
-//
-
-import Core
-import Foundation
-import Problems
-
-final class LongestSubstringWithoutRepeatingCharactersSolution: LongestSubstringWithoutRepeatingCharactersDefinition {
-    
-    func lengthOfLongestSubstring(_ s: String) -> Int {
-        return -1
-    }
-}
diff --git a/Tests/SolutionsTests/003 - Longest Substring Without Repeating Characters/LongestSubstringWithoutRepeatingCharactersSolutionTests.swift b/Tests/SolutionsTests/003 - Longest Substring Without Repeating Characters/LongestSubstringWithoutRepeatingCharactersSolutionTests.swift
index 597f093..1659d67 100644
--- a/Tests/SolutionsTests/003 - Longest Substring Without Repeating Characters/LongestSubstringWithoutRepeatingCharactersSolutionTests.swift	
+++ b/Tests/SolutionsTests/003 - Longest Substring Without Repeating Characters/LongestSubstringWithoutRepeatingCharactersSolutionTests.swift	
@@ -12,7 +12,7 @@ import XCTest
 
 final class LongestSubstringWithoutRepeatingCharactersSolutionTests: XCTestCase {
     
-    let solution: LongestSubstringWithoutRepeatingCharactersDefinition = LongestSubstringWithoutRepeatingCharactersSolution()
+    let solution: LongestSubstringWithoutRepeatingCharactersDefinition = LongestSubstringWithoutRepeatingCharactersBruteForceSolution()
     
     func testSolution() {
         for testData in data {