chore: clean up obsolete examples

work/1/Easy/Array/217.contains-duplicate.py

@@ -9,7 +9,7 @@ Given an integer array nums, return true if any value appears at
 least twice in the array, and return false if every element is
 distinct.
 
- 
+
 
 Example 1:
 
@@ -37,15 +37,16 @@ Input: nums = [1,1,1,3,3,4,3,2,4,2]
 
 Output: true
 
- 
+
 
 Constraints:
 
-	• 1 <= nums.length <= 10^5
+        • 1 <= nums.length <= 10^5
 
-	• -10^9 <= nums[i] <= 10^9
+        • -10^9 <= nums[i] <= 10^9
 """
 
+
 class Solution:
     def containsDuplicate(self, nums: List[int]) -> bool:
-        
+        return len(set(nums)) != len(nums)