PatternLens turns 2400+ LeetCode problems into 120 clear visual patterns — so you stop grinding, and start seeing.
12,400+ devs learning today
PATTERN 04
sliding window
2 pointers · O(n)
PATTERN 12
dp · knapsack
PATTERN TIP
try a hashmap.
avg: O(1) lookup
trusted by engineers at
120+
patterns indexed
2.4k
curated questions
98%
interview coverage
150+
code templates
02'
Every LeetCode problem belongs to a small set of recurring patterns. We make them obvious.
Browse patterns01
Pattern-first learning
Stop memorizing. See the recurring patterns behind every problem.
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Structured notes & templates
Handwritten code blocks, key insights, and templates for 120+ interview patterns.
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Adaptive roadmaps
Tell us your goal. Get a personalised path with checkpoints and timelines.
03'
04'
step
01'
Pick your goal
FAANG, start-up, or just fundamentals.
step
02'
Learn the patterns
Bite-sized visual lessons for each one.
step
03'
Crack the problem
Apply the pattern to the actual question.
05' — ready?