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If you’ve been thinking about investing in a serious portable power station, there couldn't be a better time to do it. As of Feb. 26, the Jackery Explorer 2000 v2 is on sale at Amazon and it's discounted by more than $400. This deal takes the price down from $1,199 to $779.。heLLoword翻译官方下载对此有专业解读
// 2. 计算前缀和：count[i]表示<=i的元素个数
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