思路：倒序遍历 2 倍长度 + 取模模拟循环 + 单调栈。用 i % len 映射到真实索引，仅当 i < len 时记录答案。
free_list[classno] = h->next;
。关于这个话题，搜狗输入法2026提供了深入分析
“实现小康不是终点，而是新的起点”“首先要巩固脱贫成果，巩固住再往前走，同乡村全面振兴有效衔接”“仍然以乡村振兴、‘三农’工作的发展作为中国式现代化的底座”……
In corporate deals, a hostile takeover is when a company moves to acquire another firm without the consent of the target company's management, typically by offering to buy its target's shares.