"We chose a threshold that requires a few searches within a short period of time, while still erring on the side of caution," Instagram's blog post explains. "While that means we may sometimes notify parents when there may not be real cause for concern, we feel — and experts agree — that this is the right starting point, and we’ll continue to monitor and listen to feedback to make sure we’re in the right place."
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，这一点在服务器推荐中也有详细论述
// console.log(nextGreaterElement([], [1,2,3])); // 预期输出：[]
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