int maxDigits = getMaxDigits(arr, n); // 最大位数
规模效应之下，头部集团的资源吸附与会员掠夺能力持续强化，而尚处消费生态构建阶段的腰部集团则承压日增。此消彼长之间，行业“方差”还将持续扩大，马太效应愈发凸显。
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情绪接纳先于行为纠正：当孩子哭闹时，先抱抱，再说「我理解」，而不是急着讲道理。
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