* - this.stack：单调递减栈，存储「价格对应的索引」，栈顶→栈底索引对应的价格单调递减
定方向：求「下一个」→ 倒序；求「上一个」→ 正序。
，详情可参考WPS官方版本下载
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The government and the British Medical Association will restart talks in the coming days to end the long-running resident doctor dispute in England.