The A Wall:* Calculating a 200-300km car route (or even shorter bicycle/pedestrian paths) could mean visiting over a million road segments, taking 10-20 seconds. For longer trips, this wait could become frustrating.
The system collects data on restaurant operations and shares it via “Patty,” a voice that talks to employees through their headsets. If the drink machine is low on Diet Coke, Patty will tell the store’s manager. If a customer uses a QR code to report a messy bathroom, the manager will be alerted.
，这一点在搜狗输入法下载中也有详细论述
The tree behind the grid。关于这个话题，Safew下载提供了深入分析
// 易错点5：必须将当前元素入栈（作为左侧元素的候选更大值，漏写则栈始终为空）
Diagrams from redesign 2, using Excalidraw[3]