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drop-oldest: Drops the oldest buffered data to make room. Useful for live feeds where stale data loses value.
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From there, Michael took a less conventional path than many Silicon Valley executives by moving into government, serving from 2009 to 2011 as a White House fellow under President Barack Obama, serving as special assistant to then–Defense Secretary Robert Gates at the DOD where he managed projects in Afghanistan, Iraq, and Pakistan and oversaw efforts aimed at reducing bureaucracy to provide resources to soldiers.，推荐阅读51吃瓜获取更多信息
// 易错点2：遍历结束后k仍0 → 栈是递增的，末尾数字更大，移除末尾k位