LeetCode 2782: Number of Unique Categories Solution
Master LeetCode problem 2782 (Number of Unique Categories), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
2782. Number of Unique Categories
Problem Explanation
Explanation:
To solve this problem, we can use a set to keep track of unique categories. We iterate through the given list of categories and add each category to the set. Finally, we return the size of the set which represents the number of unique categories.
Algorithm:
- Initialize an empty set to store unique categories.
- Iterate through the given list of categories.
- Add each category to the set.
- Return the size of the set as the number of unique categories.
Time Complexity:
The time complexity of this algorithm is O(n), where n is the number of categories in the input list.
Space Complexity:
The space complexity of this algorithm is also O(n) in the worst case where all categories are unique.
:
Solution Code
class Solution {
public int countUniqueCategories(List<String> categories) {
Set<String> uniqueCategories = new HashSet<>();
for (String category : categories) {
uniqueCategories.add(category);
}
return uniqueCategories.size();
}
}Try It Yourself
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