• 269 LeetCode (Java) and 16 Codeforces (C++) solutions indexed by 21 techniques, each with its key idea and time/space complexity.
• data/problems.json: the same index as machine-readable data.
• CI compiles every solution and keeps the README index in sync.
• leetcode-coach skill for Claude Code and Codex: hints one step at a time, a review of your attempt, and what to solve next.

Install the skill in Claude Code:

/plugin marketplace add elchibek5/leetcode-patterns-java
/plugin install leetcode-coach@elchibek5-leetcode