| LetRec of name * expr * expr (* let rec f = e1 in e2 *)
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题号题目核心考点496下一个更大元素 I单调栈 + Map 缓存739每日温度下一个更大 + 存索引算距离503下一个更大元素 II循环数组（2 倍长度 + 取模）1019链表中的下一个更大节点链表转数组 + 模板1944队列中可以看到的人数弹栈计数 + 栈顶是否可见1475商品折扣后的最终价格右侧第一个 ≤ cur901股票价格跨度上一个更大（正序）402移掉 K 位数字单调递增栈 + k 限制853车队排序 + 时间比较（可不用栈）581最短无序连续子数组边界 + 最值扩展（非纯单调栈）
For their part, tech companies are increasingly sounding the alarm on this need. A lack of electricians “may constrain America’s ability to build the infrastructure needed to support AI,” according to a Google policy report. Microsoft has gone even further, with president Brad Smith identifying electrical talent shortages as the No. 1 problem slowing their data center expansion in the U.S.