is subsequence

src/my_project/interviews/top_150_questions_round_12/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_12/test_is_subsequence_round_12.py

@@ -0,0 +1,17 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_12\
+.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)
+