Problem OCR
Capture the LeetCode problem with a global hotkey.
Use case · LeetCode
AI LeetCode helper with OCR, Big-O, and pattern recognition
Darknote.ai is your invisible AI helper for LeetCode in real interviews. OCR captures the problem, the AI recognizes the pattern (two pointers, sliding window, DP), suggests the optimal algorithm, and explains time and space complexity.
1 interview free · No credit card
LeetCode doesn't forgive in real interviews
You know the pattern in practice. Under pressure, you forget it.
- Hard problems in 30-40 minutes with no context.
- The classic pattern comes disguised and you don't recognize it.
- Your solution works but the interviewer asks for O(n) instead of O(n log n).
- Virtual whiteboard with no autocomplete and no testing.
LeetCode patterns Darknote recognizes
The 12 patterns covering 80% of technical questions.
Two Pointers / Sliding Window
Substring, k-distinct chars, max sum subarray.
DarknoteDarknote detects 'contiguous subarray' and suggests sliding window with HashMap.
BFS / DFS / Backtracking
Graphs, trees, permutations.
DarknoteFor 'path in tree' recommends recursive DFS with pruning.
Dynamic Programming
Knapsack, LIS, edit distance.
DarknoteDetects 'subsequence' and proposes top-down memo or tabulation DP.
Heap / Priority Queue
Top-K, merge sorted lists.
DarknoteFor 'k closest points' suggests size-k max-heap.
LeetCode helper features
Designed specifically for algorithm problems.
Pattern recognition
Identifies two pointers, sliding window, BFS, DFS, DP, heap, trie, etc.
Optimal solution with Big-O
Recommended algorithm with time and space complexity.
Automatic edge cases
Empty, single element, duplicates, negative, overflow.
Multiple languages
Python, JS, TS, Java, Go, C++, Rust with native syntax.
Hint mode
Ask for a hint without the full solution to keep your prep honest.
LeetCode workflow with Darknote
Proven structure in real interviews.
- Step/01
Capture the problem
Global hotkey → OCR processes the LeetCode prompt in 2 seconds.
- Step/02
Recognize the pattern
The AI detects the pattern (sliding window, DP, etc.) and tells you.
- Step/03
Get the strategy
Structure: data structure, main loop, edge cases, complexity.
- Step/04
Code with backup
If stuck, capture your current code for diagnosis.
- Step/05
Optimize on request
Improve to optimal complexity when the interviewer pushes.
“I had a LeetCode Hard in my Amazon interview. Darknote recognized the Trie + DFS pattern in 5 seconds. I solved it and closed the offer.”
Daniel V.SDE II @ Amazon
Preguntas frecuentes
Frequently asked questions
Yes. OCR captures any problem visible on screen, including LeetCode Premium and Amazon/Google problems.
Solve any LeetCode in your interview
Download Darknote.ai. 10 free minutes on signup to test the OCR Code Copilot.
Download free
1 interview free · No credit card