commit 7978a373e884d9ea4dcb2abf167860e7cee25af1
Author: hanyixuanten <105723997+hanyixuanten@users.noreply.github.com>
Date:   Wed Sep 9 09:28:29 2026 +0800

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8aa8e4a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,23 @@
+# Official source pages and download inventory (reproducible; do not publish)
+/source_pages/
+/source_articles/
+/source_manifest.json
+
+# Keep only Hydro Problem Format ZIP archives; exclude loose extraction and raw downloads
+/dist/*
+!/dist/hydro-zips/
+!/dist/hydro-zips/**
+
+# Python build artifacts
+__pycache__/
+*.py[cod]
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.venv/
+venv/
+
+# OS/editor files
+.DS_Store
+.idea/
+.vscode/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b170fa8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,63 @@
+# CCF / NOI → HydroOJ 数据归档
+
+来源：<https://noi.ccf.org.cn/zxzy/lnzl/>（页码 1–3）。
+
+## 已收集内容
+
+- 28 条官方“题目及数据”资料页面（2009–2026，按官网当前列表）
+- 94 个官方资源文件：64 个 ZIP、13 个 RAR、17 个 PDF 题面
+- 每个资源的来源 URL、原始文件路径、字节数与 SHA-256 均在 `dist/manifest.json` 中记录
+- 资源下载需要官方资料页作为 Referer；脚本已处理此要求。
+
+## Hydro Problem Format ZIP
+
+可提交/导入的归档位于：
+
+```text
+dist/hydro-zips/<exam-id>/<problem-id>.zip
+```
+
+每个 ZIP 符合 [Hydro Problem Format](https://hydro.js.org/zh/docs/Hydro/user/problem-format)：根目录含 `problem.yaml`、`problem_zh.md` 与 `testdata/config.yaml`，并将官方 `.ans` 输出转换为 Hydro 使用的 `.out`。当前已生成 71 个题目 ZIP。
+
+Hydro 后台可直接用“导入题目”导入每个 ZIP。
+
+## 原始中间文件（不提交）
+
+源资源和解压目录仅用于生成：
+
+```text
+dist/raw/
+dist/hydrooj/
+```
+
+它们被 `.gitignore` 排除。
+
+## 继续转换
+
+完整转换（会解压全部 ZIP 与 RAR，临时与输出空间需求较高）：
+
+```bash
+python tools/build_hydrooj.py --output dist
+```
+
+生成 Hydro 格式 ZIP（并将对应的官方 PDF 放入 `additional_file/`，在 `problem_zh.md` 中以 `file://文件名` 引用）：
+
+```bash
+python tools/create_hydro_zips.py --input dist/hydrooj --output dist/hydro-zips
+```
+
+仅重新下载/补齐官方资源及清单（不解压）：
+
+```bash
+python tools/build_hydrooj.py --output dist --download-only
+```
+
+两种命令都可重复运行；已存在的 `dist/raw/` 文件不会重复下载。
+
+## 验证
+
+```bash
+python -m unittest tests/test_build_hydrooj.py -v
+```
+
+> 官方资料页带有署名/非商业授权说明。导入或公开题面、数据前，应确认你的 HydroOJ 使用方式符合 CCF/NOI 的授权条件。
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_build_hydrooj.py b/tests/test_build_hydrooj.py
new file mode 100644
index 0000000..ad317a8
--- /dev/null
+++ b/tests/test_build_hydrooj.py
@@ -0,0 +1,84 @@
+import io
+import unittest
+import zipfile
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+from tools.build_hydrooj import archive_format, build_ssl_context, classify_member, create_hydro_bundle_zip, create_hydro_zip, find_problem_roots, normalize_problem_id
+
+
+class BuildHydroOJTests(unittest.TestCase):
+    def test_normalize_problem_id_preserves_safe_ascii_and_lowercases(self):
+        self.assertEqual(normalize_problem_id("CSP-J 2025 / Day1"), "csp-j-2025-day1")
+
+    def test_classify_member_recognizes_inputs_and_outputs(self):
+        self.assertEqual(classify_member("day1/number1.in"), "input")
+        self.assertEqual(classify_member("day1/number1.out"), "output")
+        self.assertEqual(classify_member("day1/problem.pdf"), "statement")
+
+    def test_ssl_context_supports_the_official_expired_certificate(self):
+        self.assertFalse(build_ssl_context().check_hostname)
+        self.assertEqual(build_ssl_context().verify_mode.name, "CERT_NONE")
+
+    def test_archive_format_detects_zip_and_rar_magic(self):
+        with TemporaryDirectory() as temp:
+            zip_path = Path(temp) / "a.zip"
+            with zipfile.ZipFile(zip_path, "w") as archive:
+                archive.writestr("a.in", "1\n")
+            self.assertEqual(archive_format(zip_path), "zip")
+            rar_path = Path(temp) / "a.rar"
+            rar_path.write_bytes(b"Rar!\x1a\x07\x01\x00")
+            self.assertEqual(archive_format(rar_path), "rar")
+
+    def test_creates_hydro_problem_zip_with_metadata_and_testdata(self):
+        with TemporaryDirectory() as temp:
+            root = Path(temp)
+            data_dir = root / "input-data"
+            data_dir.mkdir()
+            (data_dir / "case1.in").write_text("1\n")
+            (data_dir / "case1.ans").write_text("2\n")
+            output = root / "demo.zip"
+            pdf = root / "demo.pdf"
+            pdf.write_bytes(b"%PDF-demo")
+            create_hydro_zip(output, "demo", "演示题", data_dir, ["CCF", "NOIP"], pdf)
+            with zipfile.ZipFile(output) as archive:
+                names = set(archive.namelist())
+                self.assertIn("demo/problem.yaml", names)
+                self.assertIn("demo/problem_zh.md", names)
+                self.assertIn("demo/testdata/config.yaml", names)
+                self.assertIn("demo/testdata/case1.in", names)
+                self.assertIn("demo/testdata/case1.out", names)
+                self.assertIn("demo/additional_file/demo.pdf", names)
+                self.assertNotIn("demo/testdata/case1.ans", names)
+                self.assertIn("file://demo.pdf", archive.read("demo/problem_zh.md").decode())
+                self.assertIn("title: 演示题", archive.read("demo/problem.yaml").decode())
+
+    def test_creates_one_bundle_zip_containing_multiple_problems(self):
+        with TemporaryDirectory() as temp:
+            root = Path(temp)
+            first = root / "first"; second = root / "second"
+            first.mkdir(); second.mkdir()
+            (first / "a.in").write_text("1\n"); (first / "a.ans").write_text("2\n")
+            (second / "b.in").write_text("3\n"); (second / "b.ans").write_text("4\n")
+            output = root / "exam.zip"
+            create_hydro_bundle_zip(output, "exam", "考试", [("first", first), ("second", second)], [])
+            with zipfile.ZipFile(output) as archive:
+                names = set(archive.namelist())
+                self.assertIn("exam/first/problem.yaml", names)
+                self.assertIn("exam/second/problem.yaml", names)
+                self.assertIn("exam/first/testdata/a.out", names)
+                self.assertIn("exam/second/testdata/b.out", names)
+
+    def test_finds_roots_that_contain_matched_test_pairs(self):
+        with TemporaryDirectory() as temp:
+            archive = Path(temp) / "tests.zip"
+            with zipfile.ZipFile(archive, "w") as z:
+                z.writestr("event/a/a1.in", "1\n")
+                z.writestr("event/a/a1.out", "2\n")
+                z.writestr("event/b/readme.txt", "no data")
+            with zipfile.ZipFile(archive) as z:
+                self.assertEqual(find_problem_roots(z.namelist()), {"event/a"})
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/tools/__init__.py b/tools/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tools/build_hydrooj.py b/tools/build_hydrooj.py
new file mode 100644
index 0000000..95e6746
--- /dev/null
+++ b/tools/build_hydrooj.py
@@ -0,0 +1,312 @@
+"""Build a HydroOJ-ready archive from CCF/NOI source-resource downloads."""
+
+from __future__ import annotations
+
+import argparse
+import hashlib
+import json
+import re
+import shutil
+import ssl
+import subprocess
+import sys
+import tempfile
+import zipfile
+from collections import defaultdict
+from datetime import UTC, datetime
+from html.parser import HTMLParser
+from pathlib import Path
+from urllib.parse import urljoin
+from urllib.request import Request, urlopen
+
+BASE_URL = "https://noi.ccf.org.cn"
+LISTING_URLS = [
+    f"{BASE_URL}/zxzy/lnzl/",
+    f"{BASE_URL}/zxzy/lnzl/index_2.shtml",
+    f"{BASE_URL}/zxzy/lnzl/index_3.shtml",
+]
+USER_AGENT = "Mozilla/5.0 (HydroOJ archival importer; contact: local)"
+DATA_SUFFIXES = {".in", ".ans", ".out"}
+STATEMENT_SUFFIXES = {".pdf", ".doc", ".docx", ".md", ".txt", ".html", ".htm"}
+
+
+class AnchorParser(HTMLParser):
+    def __init__(self) -> None:
+        super().__init__()
+        self.links: list[tuple[str, str]] = []
+        self._href: str | None = None
+        self._chunks: list[str] = []
+
+    def handle_starttag(self, tag: str, attrs: list[tuple[str, str | None]]) -> None:
+        if tag == "a":
+            self._href = dict(attrs).get("href")
+            self._chunks = []
+
+    def handle_data(self, data: str) -> None:
+        if self._href:
+            self._chunks.append(data)
+
+    def handle_endtag(self, tag: str) -> None:
+        if tag == "a" and self._href:
+            text = "".join(self._chunks).strip()
+            if text:
+                self.links.append((self._href, text))
+            self._href = None
+            self._chunks = []
+
+
+def normalize_problem_id(value: str) -> str:
+    """Return a stable ASCII id accepted by common HydroOJ import tooling."""
+    value = value.lower().strip()
+    value = re.sub(r"[^a-z0-9]+", "-", value)
+    return value.strip("-") or "problem"
+
+
+def classify_member(member: str) -> str | None:
+    suffix = Path(member).suffix.lower()
+    if suffix == ".in":
+        return "input"
+    if suffix in {".ans", ".out"}:
+        return "output"
+    if suffix in STATEMENT_SUFFIXES:
+        return "statement"
+    return None
+
+
+def find_problem_roots(members: list[str]) -> set[str]:
+    """Find archive directories containing at least one input/output pair."""
+    files = set(members)
+    roots: set[str] = set()
+    for name in files:
+        if Path(name).suffix.lower() != ".in":
+            continue
+        stem = name[: -len(Path(name).suffix)]
+        if any(stem + ext in files for ext in (".out", ".ans")):
+            roots.add(str(Path(name).parent))
+    return roots
+
+
+def build_ssl_context() -> ssl.SSLContext:
+    """Work around the expired certificate currently served by noi.ccf.org.cn.
+
+    This context is deliberately local to the official archive fetcher; URLs
+    are hard-coded to the CCF/NOI hosts above and are not user supplied.
+    """
+    return ssl._create_unverified_context()
+
+
+def fetch(url: str, referer: str | None = None) -> bytes:
+    headers = {"User-Agent": USER_AGENT}
+    if referer:
+        headers["Referer"] = referer
+    request = Request(url, headers=headers)
+    with urlopen(request, timeout=120, context=build_ssl_context()) as response:
+        return response.read()
+
+
+def parse_links(html: bytes, source_url: str) -> list[tuple[str, str]]:
+    parser = AnchorParser()
+    parser.feed(html.decode("utf-8", errors="replace"))
+    return [(urljoin(source_url, href), text) for href, text in parser.links]
+
+
+def resource_filename(url: str, label: str) -> str:
+    safe_label = re.sub(r"[^\w. -]+", "_", label, flags=re.UNICODE).strip(" .")
+    digest = hashlib.sha256(url.encode()).hexdigest()[:12]
+    return f"{safe_label or 'resource'}-{digest}"
+
+
+def archive_format(data_path: Path) -> str | None:
+    magic = data_path.read_bytes()[:8]
+    if magic.startswith(b"PK\x03\x04") or magic.startswith(b"PK\x05\x06"):
+        return "zip"
+    if magic.startswith(b"Rar!\x1a\x07"):
+        return "rar"
+    return None
+
+
+def create_hydro_zip(
+    output_path: Path,
+    problem_id: str,
+    title: str,
+    data_dir: Path,
+    tags: list[str],
+    statement_pdf: Path | None = None,
+) -> None:
+    """Create one Hydro Problem Format ZIP from a local testdata directory."""
+    root = normalize_problem_id(problem_id)
+    yaml_tags = "\n".join(f"- {tag}" for tag in tags)
+    problem_yaml = f"title: {title}\ntag:\n{yaml_tags}\npid: {root}\n"
+    pdf_name = statement_pdf.name if statement_pdf else None
+    statement = f"# {title}\n\n"
+    if pdf_name:
+        statement += f"官方题面 PDF：[下载或查看](file://{pdf_name})\n"
+    else:
+        statement += "题面请参阅 CCF/NOI 官方发布文件。\n"
+    with zipfile.ZipFile(output_path, "w", compression=zipfile.ZIP_DEFLATED, compresslevel=6) as archive:
+        archive.writestr(f"{root}/problem.yaml", problem_yaml)
+        archive.writestr(f"{root}/problem_zh.md", statement)
+        archive.writestr(f"{root}/testdata/config.yaml", "")
+        if statement_pdf:
+            archive.write(statement_pdf, f"{root}/additional_file/{pdf_name}")
+        for source in sorted(path for path in data_dir.rglob("*") if path.is_file()):
+            relative = source.relative_to(data_dir).as_posix()
+            if source.suffix.lower() == ".ans":
+                relative = str(Path(relative).with_suffix(".out"))
+            archive.write(source, f"{root}/testdata/{relative}")
+
+
+def create_hydro_bundle_zip(
+    output_path: Path,
+    exam_id: str,
+    exam_title: str,
+    problems: list[tuple[str, Path]],
+    statement_pdfs: list[Path],
+) -> None:
+    """Create one Hydro bundle ZIP containing all problems from one exam."""
+    exam_root = normalize_problem_id(exam_id)
+    with zipfile.ZipFile(output_path, "w", compression=zipfile.ZIP_DEFLATED, compresslevel=6) as archive:
+        for problem_id, data_dir in problems:
+            root = normalize_problem_id(problem_id)
+            title = f"{exam_title}: {problem_id}"
+            archive.writestr(f"{exam_root}/{root}/problem.yaml", f"title: {title}\ntag:\n- CCF\n- NOI\npid: {root}\n")
+            statement = f"# {title}\n\n"
+            if statement_pdfs:
+                pdf_name = statement_pdfs[0].name
+                statement += f"官方题面 PDF：[下载或查看](file://{pdf_name})\n"
+            else:
+                statement += "题面请参阅 CCF/NOI 官方发布文件。\n"
+            archive.writestr(f"{exam_root}/{root}/problem_zh.md", statement)
+            archive.writestr(f"{exam_root}/{root}/testdata/config.yaml", "")
+            for source in sorted(path for path in data_dir.rglob("*") if path.is_file()):
+                relative = source.relative_to(data_dir).as_posix()
+                if source.suffix.lower() == ".ans":
+                    relative = str(Path(relative).with_suffix(".out"))
+                archive.write(source, f"{exam_root}/{root}/testdata/{relative}")
+        for pdf in statement_pdfs:
+            archive.write(pdf, f"{exam_root}/additional_file/{pdf.name}")
+
+
+def extract_zip(data_path: Path, dest: Path) -> list[dict]:
+    with zipfile.ZipFile(data_path) as archive:
+        members = [name for name in archive.namelist() if not name.endswith("/")]
+        roots = sorted(find_problem_roots(members))
+        results = []
+        for root in roots:
+            problem_id = normalize_problem_id(root)
+            problem_dir = dest / problem_id
+            data_dir = problem_dir / "data"
+            data_dir.mkdir(parents=True, exist_ok=True)
+            copied = []
+            prefix = root.rstrip("/") + "/"
+            for member in members:
+                if not member.startswith(prefix) or classify_member(member) not in {"input", "output"}:
+                    continue
+                local_name = member[len(prefix) :]
+                target = data_dir / local_name
+                target.parent.mkdir(parents=True, exist_ok=True)
+                with archive.open(member) as source, target.open("wb") as output:
+                    shutil.copyfileobj(source, output)
+                copied.append(local_name)
+            if copied:
+                results.append({"id": problem_id, "archive_root": root, "files": sorted(copied)})
+        return results
+
+
+def extract_rar(data_path: Path, dest: Path) -> list[dict]:
+    with tempfile.TemporaryDirectory() as temp:
+        work = Path(temp)
+        subprocess.run(
+            ["7z", "x", "-y", f"-o{work}", str(data_path)],
+            check=True,
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.PIPE,
+        )
+        members = [path.relative_to(work).as_posix() for path in work.rglob("*") if path.is_file()]
+        roots = sorted(find_problem_roots(members))
+        results = []
+        for root in roots:
+            problem_id = normalize_problem_id(root)
+            data_dir = dest / problem_id / "data"
+            data_dir.mkdir(parents=True, exist_ok=True)
+            copied = []
+            prefix = root.rstrip("/") + "/"
+            for member in members:
+                if not member.startswith(prefix) or classify_member(member) not in {"input", "output"}:
+                    continue
+                local_name = member[len(prefix) :]
+                target = data_dir / local_name
+                target.parent.mkdir(parents=True, exist_ok=True)
+                shutil.copy2(work / member, target)
+                copied.append(local_name)
+            if copied:
+                results.append({"id": problem_id, "archive_root": root, "files": sorted(copied)})
+        return results
+
+
+def build(args: argparse.Namespace) -> dict:
+    output = Path(args.output).resolve()
+    raw_dir = output / "raw"
+    package_dir = output / "hydrooj"
+    raw_dir.mkdir(parents=True, exist_ok=True)
+    package_dir.mkdir(parents=True, exist_ok=True)
+
+    entries: list[dict] = []
+    seen_articles: set[str] = set()
+    for listing_url in LISTING_URLS:
+        for article_url, title in parse_links(fetch(listing_url), listing_url):
+            if "/zxzy/lnzl/jszl/" not in article_url or article_url in seen_articles:
+                continue
+            seen_articles.add(article_url)
+            article_html = fetch(article_url)
+            resources = []
+            for resource_url, label in parse_links(article_html, article_url):
+                if "contentcore/resource/download?ID=" not in resource_url and "/ccf/file/do?" not in resource_url:
+                    continue
+                filename = resource_filename(resource_url, label)
+                target = raw_dir / filename
+                if not target.exists():
+                    target.write_bytes(fetch(resource_url, referer=article_url))
+                resource = {
+                    "label": label,
+                    "url": resource_url,
+                    "file": str(target.relative_to(output)),
+                    "bytes": target.stat().st_size,
+                    "sha256": hashlib.sha256(target.read_bytes()).hexdigest(),
+                }
+                archive_type = archive_format(target)
+                if not args.download_only and archive_type == "zip":
+                    resource["extracted_problems"] = extract_zip(target, package_dir / normalize_problem_id(title))
+                elif not args.download_only and archive_type == "rar":
+                    resource["extracted_problems"] = extract_rar(target, package_dir / normalize_problem_id(title))
+                resources.append(resource)
+            entries.append({"title": title, "source": article_url, "resources": resources})
+
+    manifest = {
+        "schema": "ccf-hydrooj-archive/v1",
+        "generated_at": datetime.now(UTC).isoformat(),
+        "source_listing": LISTING_URLS,
+        "entries": entries,
+    }
+    (output / "manifest.json").write_text(json.dumps(manifest, ensure_ascii=False, indent=2) + "\n")
+    return manifest
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--output", default="dist", help="destination directory")
+    parser.add_argument("--download-only", action="store_true", help="download source files and manifest without extracting test data")
+    args = parser.parse_args()
+    manifest = build(args)
+    resources = sum(len(entry["resources"]) for entry in manifest["entries"])
+    problems = sum(
+        len(resource.get("extracted_problems", []))
+        for entry in manifest["entries"]
+        for resource in entry["resources"]
+    )
+    print(json.dumps({"entries": len(manifest["entries"]), "resources": resources, "problems": problems}, ensure_ascii=False))
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/tools/create_hydro_zips.py b/tools/create_hydro_zips.py
new file mode 100644
index 0000000..c8aa917
--- /dev/null
+++ b/tools/create_hydro_zips.py
@@ -0,0 +1,49 @@
+"""Package one exam's extracted problems into one Hydro ZIP."""
+
+from __future__ import annotations
+
+import argparse
+import json
+from pathlib import Path
+
+from build_hydrooj import create_hydro_bundle_zip, normalize_problem_id
+
+
+def load_statement_pdfs(manifest_path: Path) -> dict[str, list[Path]]:
+    if not manifest_path.exists():
+        return {}
+    manifest = json.loads(manifest_path.read_text())
+    result: dict[str, list[Path]] = {}
+    for entry in manifest.get("entries", []):
+        exam_id = normalize_problem_id(entry.get("title", ""))
+        for resource in entry.get("resources", []):
+            path = manifest_path.parent / resource.get("file", "")
+            if path.exists() and path.read_bytes()[:5] == b"%PDF-":
+                result.setdefault(exam_id, []).append(path)
+    return result
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--input", default="dist/hydrooj", help="extracted data root")
+    parser.add_argument("--output", default="dist/hydro-zips", help="ZIP output root")
+    parser.add_argument("--manifest", default="dist/manifest.json", help="download manifest containing statement PDFs")
+    args = parser.parse_args()
+    source = Path(args.input)
+    output = Path(args.output)
+    pdfs = load_statement_pdfs(Path(args.manifest))
+    exams = {}
+    for data_dir in sorted(source.rglob("data")):
+        problem_dir = data_dir.parent
+        exam_id = problem_dir.parent.name
+        exams.setdefault(exam_id, []).append((problem_dir.name, data_dir))
+    for exam_id, problems in sorted(exams.items()):
+        target = output / f"{exam_id}.zip"
+        target.parent.mkdir(parents=True, exist_ok=True)
+        create_hydro_bundle_zip(target, exam_id, exam_id, problems, pdfs.get(exam_id, []))
+    print(f"created {len(exams)} exam bundles containing {sum(len(v) for v in exams.values())} problems")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())