本次挂牌价与2021年购入成本基本相当，当时购入价约合4亿美元。项目设置较高交易门槛，保证金要求约8.7亿元，面向具备实力的航运、文旅或投资机构出让。
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// 本地测试示例：head = [2,1,5] → 输出 [5,5,0]
This challenge explores a fundamental question: what is the minimal transformer that can represent integer addition?