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At the heart of BuildKit is LLB (Low-Level Build definition). Think of it as the LLVM IR of build systems. LLB is a binary protocol (protobuf) that describes a DAG of filesystem operations: run a command, copy files, mount a filesystem. It’s content-addressable, which means identical operations produce identical hashes, enabling aggressive caching.
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实际题目往往需要先做一步转化（如循环数组、链表转数组、先排序再栈），再套上面模板即可。
setSpeed(currentSpeed + 0.5); // Comfortable, push faster