Repository Guidelines

Project Structure & Module Organization

Algorithms and data structures live under topic folders such as dataStruct/, dynamic planning/, greed/, else/, key/, and we/; each subfolder holds problem-specific source files.
Shared helpers (e.g., custom containers) sit in tools/ and tools.h; include these with -Itools when compiling C/C++.
Scratch outputs should go to build/; cmake-build-debug/ is IDE-generated and should stay untracked. Tests and small fixtures live in test/ (see test/example.txt).
Paths with spaces (e.g., dynamic planning/) need quoting in shells: g++ -std=c++17 "dynamic planning/xxx.cpp".

C++17 compile (recommended by .clangd): g++ -std=c++17 -O2 -Itools <source>.cpp -o build/<name>; add -Wall -Wextra when iterating.
C compile: gcc -O2 -Itools <source>.c -o build/<name>.
Go quick run: go run main.go.
Example test build & run: gcc -Itools test/test1.c -o build/test1 && ./build/test1.
Keep binaries inside build/ and out of version control.

Use 4-space indentation; prefer braces on new lines consistently across functions and control blocks.
Favor snake_case for C helpers and CamelCase types for C++ classes/structs; keep filenames descriptive (heap_top_k.cpp, queue_with_two_stack.c).
Rely on standard library containers/algorithms where possible; add brief comments only for non-obvious logic or tricky edge cases.
Run code through clang-format (C/C++) if available; keep Go files formatted via gofmt.

Add minimal repros under test/ named after the problem (test_<id>.c) and keep fixtures small.
When adding new logic, provide a tiny driver main or test function that exercises edge cases; show expected input/output in comments.
Prefer deterministic tests; avoid reading/writing outside the repo except for build/.

Commit messages: short, imperative, and scoped (e.g., add heap merge helper, fix queue pop bug); avoid bundling unrelated fixes.
Before opening a PR, summarize the problem solved, approach taken, and key follow-up items; paste the commands you ran (build/test) with outcomes.
Do not commit generated binaries, IDE folders (cmake-build-debug/), or local artifacts.
Link related issues or references when applicable; include screenshots only if the change affects observable output.***