定存什么：要下标/距离就栈里存索引，只要值就存值或存索引再 nums[i] 取。
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根据宝马集团公布的 2025 年财报数据，全年宝马在中国市场共售出 625527 辆 BMW 和 MINI 品牌汽车，同比大幅下滑 12.5%，较 2023 年的 82.5 万辆高点，两年间损失近 20 万辆，销量直接跌回 7 年前的水平。