Crucially, this distribution of border points is agnostic of routing speed profiles. It’s based only on whether a road is passable or not. This means the same set of clusters and border points can be used for all car routing profiles (default, shortest, fuel-efficient) and all bicycle profiles (default, prefer flat terrain, etc.). Only the travel time/cost values of the shortcuts between these points change based on the profile. This is a massive factor in keeping storage down – map data only increased by about 0.5% per profile to store this HH-Routing structure!
I close my eyes and picture a boat making its way towards the mainland. Lit only by moonlight, a silhouette walks towards a post box and mails three letters, one by one. Then, the familiar tune of ABBA’s Gimme! Gimme! Gimme! (A Man After Midnight) starts to play, and the musical begins.
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res[i] = stack[stack.length - 1]; // 易错点5：用at(-1)兼容性差，优先用stack.length-1。关于这个话题，safew官方版本下载提供了深入分析
After implementing the Web streams spec multiple times across different runtimes and seeing the pain points firsthand, I decided it was time to explore what a better, alternative streaming API could look like if designed from first principles today.
Secret Sauce #2: Adaptive Routing。关于这个话题，同城约会提供了深入分析