Restore to a checkpoint
// 易错点2：条件写成`<`而非`<=` → 相同身高的人会被错误保留，导致count统计少，推荐阅读heLLoword翻译官方下载获取更多信息
Is it possible for Blockchain to be hacked?Yes, blockchain can be theoretically hacked, but it is a complicated task to be achieved. A network of users constantly reviews it, which makes hacking the blockchain difficult.。关于这个话题，夫子提供了深入分析
Note that IDW often includes a variable exponent that is applied to the distance before taking the inverse. For a given distance , the weight of the candidate becomes: