refactor(algorithms): sliding window longest substring

Author: BrianLusina

…est_repeating_char_replacement/README.md …est_repeating_char_replacement/README.mdpystrings/longest_repeating_char_replacement/README.md renamed to algorithms/sliding_window/longest_repeating_char_replacement/README.md pystrings/longest_repeating_char_replacement/README.md renamed to algorithms/sliding_window/longest_repeating_char_replacement/README.md

@@ -13,15 +13,17 @@ def length_of_longest_substring(s: str) -> int:
     Complexity Analysis:
         Time: O(n) where n is the length of the string as we travers characters in the string
         Space: O(n) as we are storing the characters visited in a dictionary
-
-    @param s: input string
-    @return: length of the longest substring without repeating characters
+    Args:
+        s (str): input string
+    Return:
+        int: length of the longest substring without repeating characters
     """
     visited = {}
     max_length = 0
     left = 0
+    length = len(s)
 
-    for right in range(len(s)):
+    for right in range(length):
         char = s[right]
 
         if char in visited:

…t_repeating_char_replacement/__init__.py …t_repeating_char_replacement/__init__.pypystrings/longest_repeating_char_replacement/__init__.py renamed to algorithms/sliding_window/longest_repeating_char_replacement/__init__.py pystrings/longest_repeating_char_replacement/__init__.py renamed to algorithms/sliding_window/longest_repeating_char_replacement/__init__.py

@@ -0,0 +1,71 @@
+import unittest
+from . import length_of_longest_substring
+
+
+class LongestSubstringWithoutRepeatingCharactersTestCase(unittest.TestCase):
+    def test_abcabcbb(self):
+        """abcabcbb should return 3"""
+        s = "abcabcbb"
+        expected = 3
+        actual = length_of_longest_substring(s)
+        self.assertEqual(expected, actual)
+
+    def test_bbbbb(self):
+        """bbbbb should return 1"""
+        s = "bbbbb"
+        expected = 1
+        actual = length_of_longest_substring(s)
+        self.assertEqual(expected, actual)
+
+    def test_pwwkew(self):
+        """pwwkew should return 3"""
+        s = "pwwkew"
+        expected = 3
+        actual = length_of_longest_substring(s)
+        self.assertEqual(expected, actual)
+
+    def test_bbbbbb(self):
+        """bbbbbb should return 1"""
+        s = "bbbbbb"
+        expected = 1
+        actual = length_of_longest_substring(s)
+        self.assertEqual(expected, actual)
+
+    def test_empty_string(self):
+        """'' should return 0"""
+        s = ""
+        expected = 0
+        actual = length_of_longest_substring(s)
+        self.assertEqual(expected, actual)
+
+    def test_abcdbea(self):
+        """abcdbea should return 5"""
+        s = "abcdbea"
+        expected = 5
+        actual = length_of_longest_substring(s)
+        self.assertEqual(expected, actual)
+
+    def test_aba(self):
+        """aba should return 2"""
+        s = "aba"
+        expected = 2
+        actual = length_of_longest_substring(s)
+        self.assertEqual(expected, actual)
+
+    def test_abccabcabcc(self):
+        """abccabcabcc should return 3"""
+        s = "abccabcabcc"
+        expected = 3
+        actual = length_of_longest_substring(s)
+        self.assertEqual(expected, actual)
+
+    def test_aaaabaaa(self):
+        """aaaabaaa should return 2"""
+        s = "aaaabaaa"
+        expected = 2
+        actual = length_of_longest_substring(s)
+        self.assertEqual(expected, actual)
+
+
+if __name__ == "__main__":
+    unittest.main()