// 步骤1：将链表值提取到数组中（链表无法随机访问，转数组更易处理）
这些动作指向同一个变化：平台被要求把收费、定价与规则从黑箱拉回可解释、可对账、可追责的框架。对OTA来说，这更像一次商业模式压力测试。交易规模趋稳后，增长从做大订单转向提高单位变现，但抽佣与各类附加收费很快触及供给侧现金流边界，于是平台收费模式的再定价不可避免。
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Cabinet member David Vasmer said funds were provided for the purchase of vehicles, bins and the initial delivery, but the recent government financial settlement had "failed to provide any revenue funding for a weekly food waste service".。safew官方版本下载对此有专业解读
// 本地测试示例：head = [2,1,5] → 输出 [5,5,0]