Given an array of integers, find if the array contains any duplicates.
Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct.
Example 1:
Input: [1,2,3,1]
Output: true
Example 2:
Input: [1,2,3,4]
Output: false
Example 3:
Input: [1,1,1,3,3,4,3,2,4,2]
Output: true
class Solution:
     def containsDuplicate(self, nums):
         """
         :type nums: List[int]
         :rtype: bool
         """
         n_map = {}
         for n in nums:
             if n in n_map:
                 n_map[n] += 1
             else:
                 n_map[n] = 1
         for n, count in n_map.items():
             if count != 1:
                 return True
         return False
class Solution:
     def containsDuplicate(self, nums):
         """
         :type nums: List[int]
         :rtype: bool
         """
         n_map = {}
         for n in nums:
             if n in n_map:
                 n_map[n] += 1
             else:
                 n_map[n] = 1
         for n, count in n_map.items():
             if count != 1:
                 return True
         return False