adding algo

src/my_project/interviews/top_150_questions_round_22/ex_25_valid_palindrome.py

@@ -0,0 +1,21 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+import re 
+
+class Solution:
+    def isPalindrome(self, s: str) -> bool:
+
+        # To lowercase
+        s = s.lower()
+
+        # Remove non-alphanumeric characters
+        s = re.sub(pattern=r'[^a-zA-Z0-9]', repl='', string=s)
+
+        # Determine if it is palindrome or not
+        len_s = len(s)
+
+        for i in range(len_s//2):
+            if s[i] != s[len_s - 1 -i]:
+                return False 
+
+        return True 

src/my_project/interviews/top_150_questions_round_22/ex_26_is_subsequence.py

@@ -0,0 +1,18 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def isSubsequence(self, s: str, t: str) -> bool:
+
+        l1, l2 = 0, 0
+
+        len_s, len_t = len(s), len(t)
+
+        while l1 < len_s and l2 < len_t:
+
+            if s[l1] == t[l2]:
+                l1 += 1
+
+            l2 += 1
+
+        return l1 == len_s

tests/test_150_questions_round_22/test_25_valid_palindrome_round_22.py

@@ -0,0 +1,15 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_25_valid_palindrome import Solution
+
+class ValidPalindromeTestCase(unittest.TestCase):
+
+    def test_is_valid_palindrome(self):
+        solution = Solution()
+        output = solution.isPalindrome(s="A man, a plan, a canal: Panama")
+        self.assertTrue(output)
+
+    def test_is_no_valid_palindrome(self):
+        solution = Solution()
+        output = solution.isPalindrome(s="race a car")
+        self.assertFalse(output)

tests/test_150_questions_round_22/test_26_is_subsequence_round_22.py

@@ -0,0 +1,15 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_26_is_subsequence import Solution
+
+class IsSubsequenceTestCase(unittest.TestCase):
+
+    def test_is_subsequence(self):
+        solution = Solution()
+        output = solution.isSubsequence(s="abc", t="ahbgdc")
+        self.assertTrue(output)
+
+    def test_is_no_subsequence(self):
+        solution = Solution()
+        output = solution.isSubsequence(s="axc", t="ahbgdc")
+        self.assertFalse(output)