Hey I am Zana
0%

[筆記] Leetcode - 217. Contains Duplicate

Posted on Symbols count in article: 581 Reading time ≈ 1 mins.

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.

1
2
3
4
5
6
7
8
9
10
11
class Solution:
    def containsDuplicate(self, nums: List[int]) -> bool:
        ans = {}

        for num in nums:
            if num in ans:
                return True
            else:
                ans[num] = 1
            
        return False
1
2
3
4
5
6
7
8
9
10
11
12
class Solution:
    def containsDuplicate(self, nums: List[int]) -> bool:
        ans = {}
        
        for num in nums:
            if ans.get(num):
                return True
            else:
                ans[num] = 1
        
        return False

1
2
3
class Solution:
    def containsDuplicate(self, nums: List[int]) -> bool:
        return len(nums) != len(list(set(nums)))