Practice Two Sum (9.4.1) - Apply Data Structures and Algorithms to Solve Real-World Programming Challenges
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Two Sum

Practice - Two Sum

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Practice Questions

Test your understanding with targeted questions

Question 1 Easy

What is the time complexity of the naive approach for the Two Sum problem?

💡 Hint: Consider how many times you would need to iterate through the array.

Question 2 Easy

Why is the hash map approach preferred over the naive method?

💡 Hint: Focus on the efficiency of accessing elements.

4 more questions available

Interactive Quizzes

Quick quizzes to reinforce your learning

Question 1

What is the primary goal of the Two Sum problem?

To sort an array
To find two indices with a specific sum
To identify duplicates

💡 Hint: Recall the definition we discussed earlier.

Question 2

The optimal solution for Two Sum uses which data structure?

Array
Linked List
Hash Map

💡 Hint: Think about what structures give us quick access to elements.

2 more questions available

Challenge Problems

Push your limits with advanced challenges

Challenge 1 Hard

Design an algorithm that finds more than two pairs in an array that sum to the target without duplicates.

💡 Hint: How would you adjust your approach to store multiple pairs?

Challenge 2 Hard

Create a variant of the Two Sum problem where the array is sorted in ascending order. How would the approach change and what would be the time complexity?

💡 Hint: Consider how sorting changes the way you would access elements.

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Reference links

Supplementary resources to enhance your learning experience.