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* 核心思路：单调递减栈（找「上一个比当前价格大的元素索引」），时间复杂度O(n)，空间复杂度O(n)
。业内人士推荐Line官方版本下载作为进阶阅读
printf("=== 排序算法性能测试 (n=%d) ===\n", N);
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