adding algo

src/my_project/interviews/top_150_questions_round_22/ex_21_reverse_words_in_string.py

@@ -0,0 +1,9 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def reverseWords(self, s: str) -> str:
+
+        lst_words = s.split()
+        lst_words.reverse()
+        return ' '.join(lst_words)

src/my_project/interviews/top_150_questions_round_22/ex_22_zig_zag.py

@@ -0,0 +1,36 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def convert(self, s: str, numRows: int) -> str:
+        """
+        Alternative implementation with detailed comments.
+        """
+
+        # Handle edge cases
+        if numRows == 1 or numRows >= len(s):
+            return s
+
+        # Initialize rows
+        rows = [''] * numRows
+        current_row = 0
+        going_down = False
+
+        # Process each character
+        for char in s:
+            # Append character to current row
+            rows[current_row] += char
+
+            # At boundaries, reverse direction
+            # - At row 0 (top): start going down
+            # - At row numRows-1 (bottom): start going up
+            if current_row == 0 or current_row == numRows - 1:
+                going_down = not going_down
+
+            # Update current row based on direction
+            # going_down=True: increment row (1, 2, 3...)
+            # going_down=False: decrement row (...3, 2, 1)
+            current_row += 1 if going_down else -1
+
+        # Join all rows into final result
+        return ''.join(rows)

tests/test_150_questions_round_22/test_21_reverse_words_in_string_round_22.py

@@ -0,0 +1,23 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_21_reverse_words_in_string import Solution
+
+class ReverseWordsInStringTestCase(unittest.TestCase):
+
+    def test_first_pattern(self):
+        solution = Solution()
+        output = solution.reverseWords(s = "the sky is blue")
+        target = "blue is sky the"
+        self.assertEqual(target, output)
+
+    def test_second_pattern(self):
+        solution = Solution()
+        output = solution.reverseWords(s = "  hello world  ")
+        target = "world hello"
+        self.assertEqual(target, output)
+
+    def test_third_pattern(self):
+        solution = Solution()
+        output = solution.reverseWords(s = "a good   example")
+        target = "example good a"
+        self.assertEqual(target, output)

tests/test_150_questions_round_22/test_22_zig_zag_round_22.py

@@ -0,0 +1,18 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_22_zig_zag import Solution
+
+class ZigZagTestCase(unittest.TestCase):
+
+    def test_first_pattern(self):
+        solution = Solution()
+        output = solution.convert(s = "PAYPALISHIRING", numRows = 3)
+        target = "PAHNAPLSIIGYIR"
+        self.assertEqual(target, output)
+
+    def test_second_pattern(self):
+        solution = Solution()
+        output = solution.convert(s = "A", numRows = 1)
+        target = "A"
+        self.assertEqual(target, output)
+