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Great start! You're using a hash map for O(1) lookups. Can you explain why checking target - num gives you the complement?
Because if target is 9 and current num is 2, then 9-2=7 would be the number I need to find!
Exactly! What's the time complexity of your solution?
In-browser coding with AI-powered Socratic tutoring
We've built the ultimate platform for mastering DSA. Here's what makes us different.
100 problems covering all essential DSA topics, organized by difficulty and pattern.
Easy Problems
Medium Problems
Hard Problems
DSA mastery is the #1 gate to FAANG compensation. Here's what mid-level engineers earn:
L4 SWE
total comp/year
E4 SWE
total comp/year
SDE II
total comp/year
ICT3
total comp/year
L4 SWE
total comp/year
$99
Pro Yearly
$200K+
Salary Increase
Average software engineer salary: $100K
Average FAANG mid-level salary: $300K+
That's a 2000x+ return on your $99 investment
*Salary data from Levels.fyi (2024). Results vary by individual. Completing DSA 100 Days does not guarantee employment or specific salary outcomes.
Create your account and dive into your first problem immediately.
Consistency beats intensity. One problem a day keeps unemployment away.
Our AI tutor guides you with questions, not answers. Build real problem-solving skills.
Watch your streak grow, commit solutions to GitHub, and land that dream job.
LeetCode is a great resource, but it's a problem database without structure. DSA 100 Days gives you a curated curriculum with progressive difficulty, AI tutoring that guides you without giving answers, and streak tracking to build consistency. We focus on the 100 problems that actually matter for interviews.
That's okay! The 100-day curriculum is a guide, not a strict requirement. You can take breaks when needed. Your progress is saved, and you can pick up where you left off. The AI tutor and structured approach help you stay on track even if life gets in the way.
We designed the curriculum to start from fundamentals. Day 1 begins with basic array problems and gradually introduces more complex concepts. The AI tutor adapts to your level, providing more guidance when you're stuck. Many users have gone from zero DSA knowledge to FAANG-ready.
We can't guarantee job offers—no one can. What we guarantee is that if you complete the curriculum, you'll be significantly better at DSA and technical interviews than most candidates. We offer a 30-day money-back guarantee if you're not satisfied.
Our AI tutor is specifically trained to teach using the Socratic method—it guides you with questions rather than giving direct answers. It knows the optimal solutions for each problem and helps you discover them yourself, building real problem-solving skills instead of copy-paste habits.