Add leetcode problem 3423

Author: lht102

leetcode/src/03423_maximum_difference_between_adjacent_elements_in_a_circular_array/__init__.py

@@ -0,0 +1,7 @@
+from typing import List
+from itertools import pairwise
+
+
+class Solution:
+    def maxAdjacentDistance(self, nums: List[int]) -> int:
+        return max(abs(nums[0] - nums[-1]), max(abs(x - y) for x, y in pairwise(nums)))

leetcode/src/03423_maximum_difference_between_adjacent_elements_in_a_circular_array/solution.py

@@ -0,0 +1,13 @@
+import unittest
+from .solution import Solution
+
+
+class TestSolution(unittest.TestCase):
+    def test_maxAdjacentDistance(self):
+        s = Solution()
+        self.assertEqual(s.maxAdjacentDistance([1, 2, 4]), 3)
+        self.assertEqual(s.maxAdjacentDistance([-5, -10, -5]), 5)
+
+
+if __name__ == "__main__":
+    unittest.main()