DSA TrainerCold pattern recognition. No hints, no labels.
Read a real-world scenario and name the algorithm pattern. No labels, no hints, no LeetCode titles. This drill builds the recognition skill that transfers to every new problem you haven't seen before.
Two customer service queues, each already sorted by wait time, need to be merged into a single sorted queue.
Already done the free drills? The premium ones cover graph traversal, dynamic programming, and backtracking, the patterns that show up most in phone screens and that most self-taught devs have never practiced.
What you get
- ✓The full DSA course: concept lessons, drills, graded tests, and cold-read capstones for every pattern
- ✓The full System Design course for the design round, included at no extra cost
- ✓All 52 pattern ID drills: real-world scenarios, no pattern labels
- ✓After each guess, unlock 4 pattern signals: the exact cues that identify the technique
- ✓Full guided problem set: 8-step walkthroughs, hint ladders, and a JS + Python code runner
- ✓New drills, units, and problems added every week
“This app finally made it click. I tried NeetCode, CTCI, and YouTube for years and still could not solve Two Sum. The beginner mental models for the patterns are genuinely so helpful. THANK YOU.”
Full access
$49.99 / year
or $9.99 / month
Now includes a C++ runner alongside JavaScript and Python.
LeetCode Premium is $159/year and doesn't teach you anything.
Less than one Udemy course, with guided problems instead of passive lectures.
- ✓Both courses: DSA + System Design
- ✓All 52 pattern ID drills
- ✓Full guided problem set
- ✓Cancel anytime
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New to this pattern? Learn Linked Lists free first →