习题链接：LeetCode 402. 移掉 K 位数字
You’ve actually seen this mechanism before. The # syntax= directive at the top of a Dockerfile tells BuildKit which frontend image to use. # syntax=docker/dockerfile:1 is just the default. You can point it at any image.，更多细节参见雷电模拟器官方版本下载
，更多细节参见Line官方版本下载
* Passed 8,192 random tests; not independently verified on our 10K test suite yet.。业内人士推荐快连下载安装作为进阶阅读
At some point I realized the scope was too large. I had spent the most time with msdfgen and hadn’t yet learned enough about the other libraries to write a proper guide. They all worked differently. I kept getting stuck. So I reduced the scope. In redesign 2 I decided to only use msdfgen, but show the various tradeoffs involved (atlas size, antialias width, shader derivatives, smoothing function).
// 易错点4：栈空时返回1而非i+1 → 仅i=0时正确，i0时（如i=3）会返回1而非4