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Hand-picked DSA and system design problems, all free. Track your progress, watch the walkthroughs on YouTube, and go Plus when you want the full courses.
DSA problems
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- Series Intro & Largest Element in an ArrayArrays · How the series works and how to follow Striver's sheet, then the first array problem.#1Watch →
- Second Largest Element in an ArrayArrays · Find the second largest without sorting, in a single pass.#2Watch →
- Check if Array is Sorted (and Rotated)Arrays · Verify sortedness and understand rotation, a common LeetCode pattern.#3Watch →
- Remove Duplicates from Sorted ArrayArrays · Two-pointer in-place removal of duplicates.#4Watch →
- Left Rotate Array by One / by D PlacesArrays · Rotate arrays in place; the reversal trick for D places.#5Watch →
- Move Zeroes to the EndArrays · Push zeroes to the end while keeping the order of other elements.#6Watch →
System design
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- What is System Design?System Design#1Watch →
- Horizontal Scaling & Vertical ScalingSystem Design#2Watch →
- What is capacity management?System Design#3Watch →
- What happens when you click any URL? HTTP full workingSystem Design#4Watch →
- HTTPS full working | What happens when you click google.com?System Design#5Watch →
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