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Academia.edu 自动续费退款维权实录，从 1 美元文献下载到 89 美元年费扣款，记录取消自动续费、邮件申诉、提交工单、引用退款保证、威胁 PayPal 拒付和投诉升级，并附最终退款结果。适合遭遇订阅扣款的学生和研究者参考。

Academia.edu refund dispute account, covering a $1 paper download, an unexpected $89 annual renewal, cancellation of auto-renewal, support emails, ticket escalation, refund-policy arguments, PayPal chargeback threats, BBB/FTC complaint pressure, and the final refund outcome. Useful for students and researchers facing subscription charges.

ADB SMS export tutorial for filtering messages by a specific SIM card, covering USB debugging, Android content provider queries, raw SMS text export, Python parsing into CSV, and spreadsheet filtering with sub_id. Useful before replacing a phone number tied to many accounts.

ADB 导出并筛选指定 SIM 卡短信教程，从换卡前账号排查场景出发，讲解开启 USB 调试、content query 导出短信、用 Python 将 key=value 文本结构化为 CSV、按 sub_id 在 Excel 中筛选，并附双卡短信整理思路。适合更换手机号前排查绑定账号。

Apache Hadoop single-node setup tutorial for Rocky Linux 8, covering OpenJDK 8, dedicated Hadoop user creation, passwordless SSH, pseudo-distributed configuration, firewall setup, HDFS/YARN startup, and MapReduce testing. Suitable for beginners building a local big data lab.

Rocky Linux 8 安装 Apache Hadoop 单节点集群教程，从零讲解 OpenJDK 8、Hadoop 用户、SSH 免密、伪分布式配置、环境变量、防火墙、HDFS/YARN 启动和示例任务测试。适合搭建大数据学习环境的新手。

Beginner-friendly algorithms and C++ STL guide, covering Big O notation, time and space complexity analysis, stack, queue, vector, sort, string, set, deque, priority_queue, map, nested STL usage, and practice problems. Suitable for competitive programming and C++ learners.

VS Code to VSCodium migration guide, covering VSCodium installation, extension migration, settings and keybinding paths, extension gallery configuration, Microsoft Marketplace caveats, and open-source Remote WSL/SSH alternatives. Suitable for developers who want a FLOSS editor build without telemetry.

Lagrange.OneBot 与 NoneBot QQ 机器人部署教程，从零讲解 Debian 12 环境准备、Lagrange 协议层部署、NoneBot 项目创建、systemd 后台运行和端口调整，并附登录验证与连接排错。适合想自建 QQ 机器人服务的新手。

算法入门与 C++ STL 教程，从时间复杂度、空间复杂度和 Big O 分析讲起，逐步介绍 stack、queue、vector、sort、string、set、deque、priority_queue、map 等容器与算法，并附练习题。适合算法竞赛和 C++ 初学者。