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Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
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Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Given the string 'pwwkew', what is the length of the longest substring without repeating characters?
💡 Hint: Look for the longest substring section without duplicate letters.
Question 2
Easy
In the string 'abcde', is it possible to have a substring without repeating characters?
💡 Hint: Consider the entire string and its unique characters.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the time complexity of the sliding window algorithm?
- O(n^2)
- O(n)
- O(log n)
💡 Hint: Think about how many times each character can be accessed.
Question 2
Using a hash set helps in achieving which of the following?
- True
- False
💡 Hint: Consider how duplicates are detected in the substring.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Given a long string of characters, find the longest substring without repeating characters and return it.
💡 Hint: Draw the string and visualize how the window expands and contracts.
Question 2
Create a comprehensive function to count the number of unique substrings of the longest length without repeating characters.
💡 Hint: Consider how to store substrings in a way that allows easy checking for uniqueness.
Challenge and get performance evaluation