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// 计算天数：栈非空→栈顶索引-当前索引；栈空→0（易错点3：索引差别写反）
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"Once the island is fully established with gravel on top, it will sit safely above the highest tides to offer a safe refuge for some of our bird species which are in decline," Gilchrist said.，详情可参考搜狗输入法2026
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