44 lines
644 B
Markdown
44 lines
644 B
Markdown
|
---
|
||
|
|
layout: page
|
||
|
|
title: Contains Duplicates
|
||
|
|
---
|
||
|
|
|
||
|
|
#### Sorting solution
|
||
|
|
|
||
|
|
Sort then check if consecutive numbers are increasing.
|
||
|
|
O(1) space, O(nlogn) time
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
#### HashTable/Set Solution
|
||
|
|
|
||
|
|
O(n) time, O(n) space
|
||
|
|
|
||
|
|
{% highlight python %}
|
||
|
|
|
||
|
|
def containsDuplicate(self, nums: List[int]) -> bool:
|
||
|
|
|
||
|
|
set = {}
|
||
|
|
for num in nums:
|
||
|
|
if num in set:
|
||
|
|
return True
|
||
|
|
else:
|
||
|
|
set[num] = None
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
{% endhighlight %}
|
||
|
|
|
||
|
|
|
||
|
|
#### Check len(set)==len(list)
|
||
|
|
|
||
|
|
{% highlight python %}
|
||
|
|
|
||
|
|
def containsDuplicate(self, nums: List[int]) -> bool:
|
||
|
|
|
||
|
|
return len(set(nums))!=len(nums)
|
||
|
|
|
||
|
|
{% endhighlight %}
|
||
|
|
|
||
|
|
![image1]()
|