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。
From a former fisher’s cottage a stone’s throw from the water, to a majestic Arts and Crafts house near a path to the beach
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if (n <= 1) return;。业内人士推荐搜狗输入法2026作为进阶阅读
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