feat(work): add LeetCode solutions for 217, 271, and 98

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

@@ -0,0 +1,51 @@
+"""
+217. Contains Duplicate
+Difficulty: Easy
+https://leetcode.com/problems/contains-duplicate/
+
+──────────────────────────────────────────────────
+
+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:
+
+Input: nums = [1,2,3,1]
+
+Output: true
+
+Explanation:
+
+The element 1 occurs at the indices 0 and 3.
+
+Example 2:
+
+Input: nums = [1,2,3,4]
+
+Output: false
+
+Explanation:
+
+All elements are distinct.
+
+Example 3:
+
+Input: nums = [1,1,1,3,3,4,3,2,4,2]
+
+Output: true
+
+ 
+
+Constraints:
+
+	• 1 <= nums.length <= 10^5
+
+	• -10^9 <= nums[i] <= 10^9
+"""
+
+class Solution:
+    def containsDuplicate(self, nums: List[int]) -> bool:
+