digital-didgeridoo
* 获取数字的第digit位（从右往左，0表示个位）
，详情可参考im钱包官方下载
Donald Trump says he has not made a final decision on whether to launch strikes on Iran but is “not happy” with the situation and military force – including regime change – remains an option.
Range queries ask "what's inside this box?" But sometimes the question is "what's nearest to this location?" This is the nearest neighbor problem, and you don't know how big your search radius should be. The nearest point might be right next to you or far away.
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