Explain the observation
Start with the repeated work or constraint that reveals the useful pattern.
About SolveLog
Code is the answer. Understanding is the goal.
SolveLog is a personal learning archive that turns solved LeetCode and DSA problems into short lessons you can reason through—not snippets you have to memorize.
Why it exists
A solution should leave you better prepared for the next problem.
It is easy to recognize code after seeing it. It is harder to recover the key idea from a blank editor. SolveLog focuses on that missing step: the observation that turns a brute-force approach into the right data structure or algorithm.
Each page follows the same learning path—problem, intuition, approach, working code, edge cases, complexity, and a live walkthrough of the algorithm's changing state.
394solutions explained
18problem patterns
3core views: idea, code, trace
1goal: transferable intuition
How every page is built
Trace real state
Run the algorithm on concrete examples so every pointer, window, stack, or table update is visible.
Check the edges
Document failure modes, boundary cases, and the true time and space costs.
The standard
Clear, testable, and useful.
- No unexplained code. The reasoning comes before the implementation.
- No decorative demos. Walkthroughs use real inputs and follow the actual algorithm.
- No fake shortcuts. Complexity and trade-offs are stated plainly.
Pick a problem and follow the state.
The archive is organized by difficulty, pattern, and topic.
Start exploring