在锂盐行业经历深度调整、价格快速下移的背景下，控股一座优质矿山意味着原料自给率的显著提升，也意味着在下一轮行业回暖时拥有更强的成本优势和议价能力。
// 步骤3：从后往前遍历数组（反向遍历更易理解，每个元素只入栈/出栈一次）
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Around three in 1,000 men have BRCA variants, but many will be unaware unless they have family members that are known carriers, and then had it confirmed with a test.
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count[arr[i] - min]++;