adding algo

src/my_project/interviews/top_150_questions_round_22/ex_19_length_last_word.py

@@ -0,0 +1,9 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def lengthOfLastWord(self, s: str) -> int:
+
+        lst_s = s.split()
+
+        return len(lst_s[-1])

src/my_project/interviews/top_150_questions_round_22/ex_20_longest_common_prefix.py

@@ -0,0 +1,20 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def longestCommonPrefix(self, strs: List[str]) -> str:
+
+        if not strs:
+            return ''
+
+        min_strs, max_strs = min(strs), max(strs)
+        count = 0
+
+        for i in range(len(min_strs)):
+
+            if min_strs[i] == max_strs[i]:
+                count  += 1
+            else: 
+                break
+
+        return min_strs[:count]

tests/test_150_questions_round_22/test_19_length_last_word_round_22.py

@@ -0,0 +1,11 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_19_length_last_word import Solution
+
+class LengthLastWordTestCase(unittest.TestCase):
+
+    def test_length_last_word(self):
+        solution = Solution()
+        output = solution.lengthOfLastWord(s="Hello World")
+        target = 5 
+        self.assertEqual(output, target)

tests/test_150_questions_round_22/test_20_longest_common_prefix_round_22.py

@@ -0,0 +1,23 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_20_longest_common_prefix import Solution
+
+class LongestCommonPrefixTestCase(unittest.TestCase):
+
+    def test_longest_common_prefix(self):
+        solution = Solution()
+        output = solution.longestCommonPrefix(strs=["flower","flow","flight"])
+        target = 'fl'
+        self.assertEqual(target, output)
+
+    def test_longest_no_common_prefix(self):
+        solution = Solution()
+        output = solution.longestCommonPrefix(strs=["dog","racecar","car"])
+        target = ''
+        self.assertEqual(target, output)
+
+    def test_longest_common_prefix_null_list(self):
+        solution = Solution()
+        output = solution.longestCommonPrefix(strs=[])
+        target = ''
+        self.assertEqual(target, output)