A Python command-line utility that searches for Luogu (洛谷) articles using DuckDuckGo's search engine. This tool is particularly useful for competitive programming enthusiasts who want to find articles related to specific problems or topics on the Chinese competitive programming platform Luogu.

duckduckgo_cf_luogu.py

#!/usr/bin/env python3
"""
Installation:
    pip install duckduckgo-search

Usage:
    python duckduckgo_cf_luogu.py <keyword>

Example:
    python duckduckgo_cf_luogu.py CF1980C
"""
import argparse
from duckduckgo_search import DDGS


def search_luogu_articles(keyword):
    ddgs = DDGS()
    web_results = ddgs.text(f"Luogu article {keyword}", max_results=10)
    found_web_urls = []
    for result in web_results:
        if result.get("href") and result["href"].startswith(
            "https://www.luogu.com.cn/article/"
        ):
            found_web_urls.append(result["href"])

    if found_web_urls:
        for url in found_web_urls:
            print(url)
    else:
        print(f"No Luogu articles found on the web for keyword: {keyword}")


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Search Luogu articles")
    parser.add_argument(
        "keyword",
        type=str,
        help="The keyword to search for, e.g., CF1763E",
    )
    args = parser.parse_args()

    search_luogu_articles(args.keyword)