Boeldt is a clinical psychologist with a background in child development. Her team found that nearly one in five children under the age of 13 spend four or more hours online daily, and that’s leading to increased depression and anxiety levels among the internet’s youngest users.
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// 单调栈：存储"待匹配更大值"的元素，栈内保持单调递减（核心）
Bridging the gap between this and web streams