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CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+This is a LeetCode solutions repository organized by date and problem type. The codebase contains solutions in multiple languages including C, C++, Go, and Java. The repository is structured with:
+- Date-based directories (e.g., `23/04/`, `25/11/`) containing individual problem solutions
+- Data structure implementations in the `dataStruct/` directory (LinkedList, Heap, Tree, etc.)
+- Special categories like "dynamic planning" and "else"
+
+## Development Commands
+
+### Building and Running Code
+Since this repository contains individual solution files rather than a unified project, compilation and execution is done per file:
+
+**For C/C++ files:**
+```bash
+# Compile C file
+gcc -o solution filename.c
+
+# Compile C++ file
+g++ -o solution filename.cpp
+
+# Run the compiled executable
+./solution
+```
+
+**For Go files:**
+```bash
+# Run Go file directly
+go run filename.go
+
+# Build Go executable
+go build filename.go
+```
+
+**For Java files:**
+```bash
+# Compile Java file
+javac filename.java
+
+# Run Java program
+java filename
+```
+
+### Testing Solutions
+There are no automated tests in this repository. Each solution should be tested manually by:
+1. Compiling/running the solution file directly
+2. Verifying output against expected LeetCode test cases
+3. Using the data structure helper functions (like `list()`, `len()`, `creatRandomTree()`) for debugging
+
+## Code Architecture
+
+### Data Structures
+The repository includes custom implementations of common data structures:
+- **LinkedList**: Defined in `dataStruct/LinkedList/lists.h` with `ListNode` struct and utility functions (`createRandomList`, `list`, `array`, `len`)
+- **Tree**: Defined in `dataStruct/Tree/Tree.h` with `TreeNode` struct and `creatRandomTree` function
+- **Heap**: Basic template implementation in `dataStruct/Heap/Heap.h`
+- **Queue**: Priority queue implementation in `dataStruct/Queue/PriorityQueue.c`
+
+### File Organization
+- **Date directories**: Solutions organized by year/month (e.g., `25/11/` for November 2025)
+- **Language variants**: Some problems have multiple language implementations (e.g., `3005.go`, `3005.cpp`, `3005.java`)
+- **Utility headers**: Common tools and data structures in `tools.h` and the `dataStruct/` directory
+
+### Common Patterns
+- Solutions often include debug output functions for visualizing data structures
+- Random data generation functions are provided for testing (`createRandomList`, `creatRandomTree`)
+- Header files use proper include guards and pragma once directives
+
+When working on new solutions, follow the existing patterns and place files in the appropriate date directory based on when the solution was created.