英伟达的当前困境：从“Token经济学”到“Agent经济学”的叙事危机英伟达的市值能在短短两三年时间里从3000亿美元飙升至3万亿美元，所依赖的核心叙事逻辑就是“Token经济学”：随着大模型参数爆炸式增长，推理成本将呈指数级上升，算力需求将永无止境。
"But it's a festival, they're expensive. We're a bit lucky we had two before anyone else anyway."
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res[i] = stack.length ? stack.at(-1) : -1;
Quadtree-based image compression formats and level-of-detail systems all work this way. Satellite imagery, terrain rendering, and geographic information systems use quadtree decomposition to serve data at varying resolutions: zoomed out, you see large coarse blocks; zoomed in, you see fine-grained tiles. The same principle extends to three dimensions (octrees) for volume rendering and 3D spatial indexing.