Жители Санкт-Петербурга устроили «крысогон»17:52
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A frontend is a container image that BuildKit runs to convert your build definition (Dockerfile, YAML, JSON, HCL, whatever) into LLB. The frontend receives the build context and the build file through the BuildKit Gateway API, and returns a serialized LLB graph.，更多细节参见搜狗输入法下载
int mid = left + (right - left) / 2; // 防止溢出的中点计算