第四编共4章、114条，主要内容有：
notify-on-command-finish = unfocused
。新收录的资料是该领域的重要参考
暴力做法是对每个位置向右扫描找第一个更大值，O(n²)。可抽象为：元素像一排人，身高为数值。当前人「下一个更大」= 他右侧第一个没被挡住的人（比当前矮的都被挡住）。单调栈用 O(n) 维护「右侧候选更大值」：倒序遍历，弹掉 ≤ 当前的，栈顶即答案，再入栈当前值。。新收录的资料对此有专业解读
为什么？因为国务院研究室那句“AI的尽头是能源”，点破了核心逻辑 。IEA预测到2030年，仅中国数据中心用电量就将暴增170% 。这种负荷有多可怕？它对停电零容忍，且24小时不间断。这对电网来说原本是灾难性压力，但现在剧情反转了。，推荐阅读新收录的资料获取更多信息
Without agar, countries could not produce vaccines or the “miracle drug” penicillin, especially critical in wartime. In fact, they risked a “breakdown of [the] public health service” that would have had “far-reaching and serious results,” according to Lieutenant-General Ernest Bradfield. Extracted from marine algae and solidified into a jelly-like substrate, agar provides the surface on which scientists grow colonies of microbes for vaccine production and antibiotic testing. “The most important service that agar renders to mankind, in war or in peace, is as a bacteriological culture medium,” wrote oceanographer C.K. Tseng in a 1944 essay titled “A Seaweed Goes to War.”3