def remove_common_ordered(text1, text2):
    lines1 = text1.splitlines()
    lines2 = text2.splitlines()

    # 构建文本2的行集合用于快速查找
    set2 = set(lines2)

    # 保留text1中不存在于text2的行
    result_lines = [line + '\n' for line in lines1 if line not in set2]
    return ''.join(result_lines)


if __name__ == '__main__':
    # 0到465
    for i in range(2, 467):
        md1 = "./md/1.md"
        mdn = "./md/" + str(i) + ".md"
        mdnn = "./mdd/" + str(i) + ".md"

        text = ''
        with open(md1, "r", encoding="utf-8") as f:
            markdown_text = f.read()
            text += markdown_text

        text1 = ''
        with open(mdn, "r", encoding="utf-8") as f:
            markdown_text = f.read()
            text1 += markdown_text
        output = remove_common_ordered(text1, text)

        with open(mdnn, "w", encoding="utf-8") as f:
            f.write(output)  # 结果写入新文件