If free_table[bucket] contains a value, we can pop a value off.
Nepal Police told the BBC that they "were faced with an overwhelming situation where we had to respond to multiple incidents simultaneously".
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// 易错点：取整会破坏时间比较逻辑（比如1.333取整为2，错误判定为独立车队）
不过，苹果并不打算将 MacBook Pro 定位为 iPad 替代品。触控只是新增输入方式之一，而非「触控优先」。