Merge pull request #10077 from simongreen-net/master

sgreen solutions to challenge 268

3 files changed, 92 insertions, 0 deletions

diff --git a/challenge-268/sgreen/python/ch-1.py b/challenge-268/sgreen/python/ch-1.py
new file mode 100755
index 0000000000..5566e1437b
--- /dev/null
+++ b/challenge-268/sgreen/python/ch-1.py
@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+
+import sys
+
+
+def magic_number(x: list, y: list) -> int | None:
+    # Check we have equal length lists
+    if len(x) != len(y):
+        raise ValueError('Lists must be of the same length')
+
+    # Sort the lists
+    x = sorted(x)
+    y = sorted(y)
+
+    # Calculate the difference between the first values
+    diff = y[0] - x[0]
+
+    for i in range(len(x)):
+        if y[i] - x[i] != diff:
+            # There is no single magic number
+            return None
+
+    # Return the magic number
+    return diff
+
+
+def main():
+    # Convert input into integers
+    array = [int(n) for n in sys.argv[1:]]
+    half = len(array) // 2
+    result = magic_number(array[:half], array[half:])
+    if result:
+        print(result)
+    else:
+        print('No magic number found!')
+
+
+if __name__ == '__main__':
+    main()
diff --git a/challenge-268/sgreen/python/ch-2.py b/challenge-268/sgreen/python/ch-2.py
new file mode 100755
index 0000000000..d0abc6522c
--- /dev/null
+++ b/challenge-268/sgreen/python/ch-2.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+
+import sys
+
+
+def numbers_game(ints: list) -> list:
+    # Check we have an even number of items
+    if len(ints) % 2 != 0:
+        raise ValueError('Please provide an even number of items!')
+
+    # Sort the list
+    ints = sorted(ints)
+
+    for i in range(0, len(ints), 2):
+        # Switch the pairs of numbers around
+        ints[i], ints[i+1], = ints[i+1], ints[i]
+
+    return ints
+
+
+def main():
+    # Convert input into integers
+    array = [int(n) for n in sys.argv[1:]]
+    result = numbers_game(array)
+    print(tuple(result))
+
+
+if __name__ == '__main__':
+    main()
diff --git a/challenge-268/sgreen/python/test.py b/challenge-268/sgreen/python/test.py
new file mode 100755
index 0000000000..681f2f8d21
--- /dev/null
+++ b/challenge-268/sgreen/python/test.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+
+import unittest
+ch_1 = __import__('ch-1')
+ch_2 = __import__('ch-2')
+
+
+class TestClass(unittest.TestCase):
+    def test_ch_1(self):
+        self.assertEqual(ch_1.magic_number([3, 7, 5], [9, 5, 7]), 2)
+        self.assertEqual(ch_1.magic_number([1, 2, 1], [5, 4, 4]), 3)
+        self.assertEqual(ch_1.magic_number([2], [5]), 3)
+
+    def test_ch_2(self):
+        self.assertEqual(ch_2.numbers_game([2, 5, 3, 4]), [3, 2, 5, 4])
+        self.assertEqual(
+            ch_2.numbers_game([9, 4, 1, 3, 6, 4, 6, 1]),
+            [1, 1, 4, 3, 6, 4, 9, 6]
+        )
+        self.assertEqual(ch_2.numbers_game([1, 2, 2, 3]), [2, 1, 3, 2])
+
+
+if __name__ == '__main__':
+    unittest.main()