Number (8): Everything in this space must add up to 8. The answer is 5-4, placed horizontally; 0-4, placed horizontally.
思路：倒序单调栈。弹出所有 ≤ 当前身高的元素（这些人都能被看到），count 为弹出数量；若栈非空，还能看到栈顶（第一个更高的人），故 +1。能看到的人数 = count + (栈非空 ? 1 : 0)。，详情可参考旺商聊官方下载
，这一点在WPS官方版本下载中也有详细论述
Tiny Footprint: Our HH-Routing data adds only 0.5% to 1% to OsmAnd's already incredibly compact map sizes. The entire planet's car routing data is around 800MB!，详情可参考91视频
The benefit extends beyond AI optimization. Structured content is easier for human readers to scan and comprehend too. People increasingly skim content rather than reading every word, and clear structure helps them extract key information quickly. When you optimize for both AI processing and human scanning through better structure, you improve the experience for all visitors while increasing AI citation rates.