Who owns Blockchain?Blockchain is a decentralized technology. It’s a chain of distributed ledgers connected with nodes. Each node can be any electronic device. Thus, one owns blockhain.
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const posToTime = new Map(); // 位置 → 到达终点的时间（避免重复计算）
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// 倒序遍历：从最后一天开始缓存右侧高温信息（易错点1：必须倒序）