* 3. 单调递增栈：存储独立车队的到达时间，cur栈顶才push（否则合并）。
定存什么：要下标/距离就栈里存索引，只要值就存值或存索引再 nums[i] 取。
，这一点在51吃瓜中也有详细论述
- risk_points: string[]
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· 王芳 · 来源：study资讯