Adding solution for 66

Python/66.py

@@ -0,0 +1,43 @@
+# 66. Plus One
+
+import sys
+from typing import List
+
+
+class Solution:
+    def plusOne(self, digits: List[int]) -> List[int]:
+        size: int = len(digits)
+        i: int = size - 1
+
+        while i >= 0:
+            print(i)
+            digits[i] += 1
+            if digits[i] < 10:
+                break
+            digits[i] = 0
+            if i == 0:
+                digits.insert(0, 1)
+            i -= 1
+            pass
+
+        return digits
+
+    pass
+
+
+def main() -> int:
+    def r(digits: List[int], exp: List[int]) -> None:
+        ret: List[int] = Solution().plusOne(digits.copy())
+        print(f"Solution().plusOne({digits}) = {ret} | exp: {exp}")
+        pass
+
+    r([1, 2, 3], [1, 2, 4])
+    r([4, 3, 2, 1], [4, 3, 2, 2])
+    r([9], [1, 0])
+    r([4, 3, 2, 9], [4, 3, 3, 0])
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())