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Learn data structures and algorithms through powerful visualizations, step-by-step explanations, and hands-on practice.

50+ interactive visualizers Structured courses Interview focused
Bubble Sort Step 1 of 5
Speed
1.0x
42
18
64
31
55
27
Comparing 42 and 18. Compare 42 and 18.

Code

1for i in range(n):
2 for j in range(0, n-i-1):
3 if arr[j] > arr[j+1]:
4 arr[j], arr[j+1] =
5 arr[j+1], arr[j]

Complexity

Time

O(n²)

Space

O(1)

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average rating

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coding languages

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Stage 0120 lessons

Build your foundation

Complexity, arrays, strings, linked lists, stacks, queues, and the patterns behind them.

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Stage 0232 lessons

Develop problem intuition

Trees, graphs, recursion, greedy methods, and dynamic programming—made visual.

Intermediate friendly
Stage 0315+ challenges

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Arrays & strings100%
Trees & graphs72%
Dynamic programming34%

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Interview-focused practice

Train with high-frequency problems and system design scenarios.

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Clarity changes everything

See how visual, structured learning helps developers move from confusion to confidence.

“I had solved dozens of tree problems, but I was still pattern-matching. Watching traversals execute finally gave me the mental model I was missing.”
Trees finally clicked
R

Riya S.

Frontend developer

“The learning path removed the daily decision fatigue. I knew exactly what to study, and the progress view kept me consistent through interview prep.”
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Aditya K.

Software engineer

“Switching between Python and Java while the same algorithm ran was incredibly useful. I could focus on the idea, then learn the syntax differences.”
Built real confidence
N

Neha M.

Computer science student

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