The setup can support 18,000 simultaneous wi-fi connections, while a distributed antenna system (DAS) boosts mobile phone coverage in the stadium. "So, you know your phone will work," says Phil Davies, IT Director at Everton Football Club.
示例：nums = [2,1,2,4,3] → res = [4,2,4,-1,-1]。，详情可参考夫子
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