const CourseItem items[] = {
  {
    "cpp-basic-01-hello",
    "C++基础01：环境配置与Hello World（VSCode）",
    1,
    "course:cpp-basic:01",
    "# C++基础01：环境配置与Hello World（VSCode）\n\n## 学习目标\n- 安装并打开 VSCode，创建并运行第一个 C++14 程序\n- 学会新建文件、保存、运行、查看输出\n- 了解 `main()`、`#include <iostream>`、`cout`\n\n## 推荐视频（观看后写笔记）\n- 保姆级：VSCode + mingw64 配置 C/C++（BV1tg411N7Fq）\n  - https://www.bilibili.com/video/BV1tg411N7Fq/\n- 每天五分钟学C++：01 开发工具（BV1dK4y137bk，系列入口）\n  - https://www.bilibili.com/video/BV1dK4y137bk/\n\n## 参考图文\n- LoongBa 极简配置：GCC/VSCode/HelloWorld\n  - https://github.com/LoongBa/Cpp_Beginner_Guide\n\n## 练习（完成至少 2 题）\n- B2002 Hello, World! https://www.luogu.com.cn/problem/B2002\n- P1000 超级玛丽游戏 https://www.luogu.com.cn/problem/P1000\n\n## 提交要求\n- 在本题页面下方“学习笔记”区域写下：\n  1) 你安装了什么、遇到什么坑、怎么解决\n  2) 你的 HelloWorld 代码\n  3) 你学到的 3 个关键词\n",
    {"cpp-basic","vscode","io","", "", ""}
  },
  {
    "cpp-basic-02-io",
    "C++基础02：输入输出与变量",
    1,
    "course:cpp-basic:02",
    "# C++基础02：输入输出与变量\n\n## 学习目标\n- 会用 `cin` 读入、`cout` 输出\n- 理解变量：`int / long long / double / char / string`\n\n## 推荐视频\n- 每天五分钟学C++：02 输出、03 变量（系列入口见上）\n  - https://www.bilibili.com/video/BV1dK4y137bk/\n\n## 练习\n- P1001 A+B Problem https://www.luogu.com.cn/problem/P1001\n- B2008 计算 (a+b)×c 的值 https://www.luogu.com.cn/problem/B2008\n- P5704 字母转换 https://www.luogu.com.cn/problem/P5704\n\n## 提交要求\n- 上传/填写学习笔记：写出 `cin/cout` 模板、常见错误（空格/换行）\n",
    {"cpp-basic","io","types","", "", ""}
  },
  {
    "cpp-basic-03-branch",
    "C++基础03：分支结构（if / switch）",
    2,
    "course:cpp-basic:03",
    "# C++基础03：分支结构（if / switch）\n\n## 学习目标\n- 会写 `if / else if / else` 与基本逻辑运算\n- 能处理边界与分类讨论\n\n## 练习\n- B2035 判断数正负 https://www.luogu.com.cn/problem/B2035\n- P5711 闰年判断 https://www.luogu.com.cn/problem/P5711\n- P1909 买铅笔 https://www.luogu.com.cn/problem/P1909\n\n## 提交要求\n- 笔记里写清：你如何找“边界”（例如 0、最小/最大、等于条件）\n",
    {"cpp-basic","branch","logic","", "", ""}
  },
  {
    "cpp-basic-04-loop",
    "C++基础04：循环结构（for / while）",
    2,
    "course:cpp-basic:04",
    "# C++基础04：循环结构（for / while）\n\n## 学习目标\n- 会用循环做：计数、累加、打印图形\n\n## 练习\n- B2083 画矩形 https://www.luogu.com.cn/problem/B2083\n- P1421 小玉买文具 https://www.luogu.com.cn/problem/P1421\n\n## 提交要求\n- 笔记里写：循环三要素（初始化/条件/更新）+ 你调试的方法\n",
    {"cpp-basic","loop","debug","", "", ""}
  },
  {
    "cpp-basic-05-array",
    "C++基础05：数组入门（一维）",
    3,
    "course:cpp-basic:05",
    "# C++基础05：数组入门（一维）\n\n## 学习目标\n- 会定义数组、遍历、统计\n\n## 练习\n- P1427 小鱼的数字游戏 https://www.luogu.com.cn/problem/P1427\n- P1428 小鱼比可爱 https://www.luogu.com.cn/problem/P1428\n\n## 提交要求\n- 笔记里写：数组下标从 0/1 的选择；如何避免越界\n",
    {"cpp-basic","array","", "", "", ""}
  },

  // 06~20：新增课程
  {
    "cpp-basic-06-char-string",
    "C++基础06：字符与字符串（char / string）",
    3,
    "course:cpp-basic:06",
    "# C++基础06：字符与字符串（char / string）\n\n## 学习目标\n- 区分 `char`（一个字符）与 `string`（一串字符）\n- 会做：大小写转换、统计字母、简单加密\n\n## 重点\n- `char c='A'`，`string s=\"abc\"`\n- `s.size()` / `s[i]` / 遍历字符串\n\n## 练习（完成至少 2 题）\n- P5704 字母转换 https://www.luogu.com.cn/problem/P5704\n- P5733 自动修正 https://www.luogu.com.cn/problem/P5733\n- P1914 小书童——凯撒密码 https://www.luogu.com.cn/problem/P1914\n\n## 提交要求\n- 笔记写：`string` 下标访问与越界风险（最后一个下标是 size()-1）\n",
    {"cpp-basic","string","char","", "", ""}
  },
  {
    "cpp-basic-07-operator-cast",
    "C++基础07：运算、取整与类型转换（/ %）",
    3,
    "course:cpp-basic:07",
    "# C++基础07：运算、取整与类型转换（/ %）\n\n## 学习目标\n- 写对 `+ - * / %`\n- 理解：整数除法会向下取整；`%` 只能用于整数\n- 学会用 `long long` 防止溢出\n\n## 练习\n- B2008 计算 (a+b)×c 的值 https://www.luogu.com.cn/problem/B2008\n- P1421 小玉买文具 https://www.luogu.com.cn/problem/P1421\n- P5708 三角形面积 https://www.luogu.com.cn/problem/P5708\n\n## 提交要求\n- 笔记写：什么时候要用 `long long`（例如钱、人数、乘法很大）\n",
    {"cpp-basic","math","cast","", "", ""}
  },
  {
    "cpp-basic-08-logic",
    "C++基础08：逻辑运算与边界（&& || !）",
    3,
    "course:cpp-basic:08",
    "# C++基础08：逻辑运算与边界（&& || !）\n\n## 学习目标\n- 能把题目里的“并且/或者/不是”写成条件\n- 学会找边界：等于、最小/最大、0\n\n## 练习\n- P5710 数的性质 https://www.luogu.com.cn/problem/P5710\n- P5711 闰年判断 https://www.luogu.com.cn/problem/P5711\n- P1909 买铅笔 https://www.luogu.com.cn/problem/P1909\n\n## 提交要求\n- 笔记写：你列出的边界测试用例（至少 3 个）\n",
    {"cpp-basic","logic","boundary","", "", ""}
  },
  {
    "cpp-basic-09-switch",
    "C++基础09：switch 与枚举列情况",
    3,
    "course:cpp-basic:09",
    "# C++基础09：switch 与枚举列情况\n\n## 学习目标\n- 会写 `switch/case/break`\n- 面对“情况很少”的题，会列举所有情况\n\n## 练习\n- P2433 小学数学N合一 https://www.luogu.com.cn/problem/P2433\n\n## 提交要求\n- 笔记写：为什么每个 case 后要 `break`（避免贯穿执行）\n",
    {"cpp-basic","switch","enum","", "", ""}
  },
  {
    "cpp-basic-10-for",
    "C++基础10：for循环（计数与累加）",
    3,
    "course:cpp-basic:10",
    "# C++基础10：for循环（计数与累加）\n\n## 学习目标\n- 熟练掌握 `for(初始化; 条件; 更新)`\n- 会写：求和、求最大最小、统计个数\n\n## 练习\n- P1425 小鱼的游泳时间 https://www.luogu.com.cn/problem/P1425\n- P5718 找最小值 https://www.luogu.com.cn/problem/P5718\n\n## 提交要求\n- 笔记写：循环“三要素”分别是什么\n",
    {"cpp-basic","loop","for","", "", ""}
  },
  {
    "cpp-basic-11-while",
    "C++基础11：while循环（未知次数）",
    3,
    "course:cpp-basic:11",
    "# C++基础11：while循环（未知次数）\n\n## 学习目标\n- 会用 `while` 处理：读到结束、读到 0 停止\n- 避免死循环：每次循环必须改变状态\n\n## 练习\n- P1427 小鱼的数字游戏 https://www.luogu.com.cn/problem/P1427\n- P1047 校门外的树（选做）https://www.luogu.com.cn/problem/P1047\n\n## 提交要求\n- 笔记写：你是如何避免死循环的（更新变量写在哪里）\n",
    {"cpp-basic","loop","while","", "", ""}
  },
  {
    "cpp-basic-12-nested",
    "C++基础12：嵌套循环与打印图形",
    3,
    "course:cpp-basic:12",
    "# C++基础12：嵌套循环与打印图形\n\n## 学习目标\n- 外层循环=行，内层循环=列\n- 能打印：矩形、三角形、乘法表\n\n## 练习\n- B2083 画矩形 https://www.luogu.com.cn/problem/B2083\n- P5717 三角形分类（练分类讨论 + 输出格式）https://www.luogu.com.cn/problem/P5717\n\n## 提交要求\n- 笔记写：你画图时是怎么想“行/列”的\n",
    {"cpp-basic","nested-loop","print","", "", ""}
  },
  {
    "cpp-basic-13-array-ops",
    "C++基础13：数组进阶（统计/查找/反转）",
    4,
    "course:cpp-basic:13",
    "# C++基础13：数组进阶（统计/查找/反转）\n\n## 学习目标\n- 用数组做：统计、查找位置、反转、去重（了解）\n\n## 练习\n- P1428 小鱼比可爱 https://www.luogu.com.cn/problem/P1428\n- P5727 冰雹猜想 https://www.luogu.com.cn/problem/P5727\n\n## 提交要求\n- 笔记写：数组越界的 2 个典型原因 + 你的检查方法\n",
    {"cpp-basic","array","practice","", "", ""}
  },
  {
    "cpp-basic-14-function",
    "C++基础14：函数入门（把重复代码变成工具）",
    4,
    "course:cpp-basic:14",
    "# C++基础14：函数入门（参数/返回值/作用域）\n\n## 学习目标\n- 会定义并调用函数\n- 知道局部变量作用域（{} 内有效）\n\n## 练习\n- P5735 距离函数 https://www.luogu.com.cn/problem/P5735\n- P5739 计算阶乘（也可用递归）https://www.luogu.com.cn/problem/P5739\n\n## 提交要求\n- 笔记写：你把哪段重复代码抽成了函数？为什么这样更清晰？\n",
    {"cpp-basic","function","scope","", "", ""}
  },
  {
    "cpp-basic-15-recursion",
    "C++基础15：递归入门（选学）",
    4,
    "course:cpp-basic:15",
    "# C++基础15：递归入门（选学）\n\n## 学习目标\n- 理解递归：函数调用自己\n- 必须有终止条件（否则会无限调用）\n\n## 练习\n- P5739 计算阶乘 https://www.luogu.com.cn/problem/P5739\n- P1028 数的计算（选做）https://www.luogu.com.cn/problem/P1028\n\n## 提交要求\n- 笔记写：你的递归“终止条件”是什么？\n",
    {"cpp-basic","recursion","", "", "", ""}
  },
  {
    "cpp-basic-16-struct",
    "C++基础16：结构体 struct（选学）",
    4,
    "course:cpp-basic:16",
    "# C++基础16：结构体 struct（选学）\n\n## 学习目标\n- 用 `struct` 把多个字段打包成一个“人物卡/记录”\n- 学会 `struct` 数组\n\n## 练习\n- P5740 最厉害的学生 https://www.luogu.com.cn/problem/P5740\n- P5744 培训 https://www.luogu.com.cn/problem/P5744\n\n## 提交要求\n- 笔记写：struct 适合用在什么场景（多个属性属于同一个对象）\n",
    {"cpp-basic","struct","", "", "", ""}
  },
  {
    "cpp-basic-17-sort",
    "C++基础17：排序初步（sort）",
    4,
    "course:cpp-basic:17",
    "# C++基础17：排序初步（sort）\n\n## 学习目标\n- 会用 `#include <algorithm>` 和 `sort`\n- 排序后做统计/查找会更简单\n\n## 练习\n- P1059 明明的随机数 https://www.luogu.com.cn/problem/P1059\n- P1093 奖学金（选做）https://www.luogu.com.cn/problem/P1093\n\n## 提交要求\n- 笔记写：sort 的区间是 `[begin, end)`（end 不包含）\n",
    {"cpp-basic","sort","algorithm","", "", ""}
  },
  {
    "cpp-basic-18-binary-search",
    "C++基础18：二分查找初步（lower_bound）",
    4,
    "course:cpp-basic:18",
    "# C++基础18：二分查找初步（lower_bound）\n\n## 学习目标\n- 理解“在有序数组里快速找答案”\n- 会用 `lower_bound` 找第一个 >= x 的位置\n\n## 练习\n- P2249 查找 https://www.luogu.com.cn/problem/P2249\n\n## 提交要求\n- 笔记写：二分查找的前提：数组必须有序\n",
    {"cpp-basic","binary-search","", "", "", ""}
  },
  {
    "cpp-basic-19-prefix-sum",
    "C++基础19：前缀和（区间求和神器）",
    4,
    "course:cpp-basic:19",
    "# C++基础19：前缀和（区间求和神器）\n\n## 学习目标\n- 会构造前缀和 `s[i]=s[i-1]+a[i]`\n- 会算区间和 `sum(l,r)=s[r]-s[l-1]`\n\n## 练习\n- P8218 求区间和（前缀和基础）https://www.luogu.com.cn/problem/P8218\n\n## 提交要求\n- 笔记写：下标偏移是怎么处理的（从 1 开始更方便）\n",
    {"cpp-basic","prefix-sum","", "", "", ""}
  },
  {
    "cpp-basic-20-simulation",
    "C++基础20：模拟题与综合复盘",
    4,
    "course:cpp-basic:20",
    "# C++基础20：模拟题与综合复盘\n\n## 学习目标\n- 学会按题意一步步做（模拟）\n- 复盘：总结常见错误 + 常用模板\n\n## 练习（从这里选 3~5 题做小测）\n- P1957 口算练习题 https://www.luogu.com.cn/problem/P1957\n- P1055 ISBN号码 https://www.luogu.com.cn/problem/P1055\n- P2433 小学数学N合一（回顾）https://www.luogu.com.cn/problem/P2433\n\n## 提交要求\n- 笔记写：\n  1) 你最常犯的 3 类错误\n  2) 你最常用的 5 行代码模板\n  3) 下周你准备怎么练\n",
    {"cpp-basic","simulation","review","", "", ""}
  },
};