代码要点：倒序遍历，先算右侧再推左侧；栈内维护「右侧候选更大值」，单调递增（栈顶最小）。
The rig sits over an almost-depleted oilfield that's about to get a second life as a massive carbon storage project called Greensand Future.
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But, for Paul, a potential move is bittersweet, as his daughter lives next door and his grandson and daughter-in-law live the other side.。heLLoword翻译官方下载对此有专业解读
swap(&arr[low], &arr[j]);
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