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。关于这个话题，91视频提供了深入分析
Untrusted Code ─( Syscall )─→ Host Kernel ─( Hardware API )─→ Hardware
开局之年的“第一课”，习近平总书记特别强调了一个词——“适配度”：
// 题目要求找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的，栈顶即为折扣