[cps] [subway] LineId and StationId as string

TODO.md

@@ -1,7 +1,7 @@
-[cps] [subway] `defineLine` -- take a ordered list of stations
-
 [cps] [subway] `defineStation`
 
+[cps] [subway] `defineLine` -- take a ordered list of stations
+
 [cps] [subway] define `bostonSubway`
 
 [cps] [problem-space] [subway] `SubwayProblemSpace` & `createSubwayProblemSpace`
@@ -22,7 +22,6 @@
   然后删除非 normal 的 path，所谓 normal path，
   即，没有在一条 line 上下车上车的现象的 path。
 
-
 # later
 
 [cps] 也许用深圳的地铁作为例子，并且写一个模仿《百度地图》的前端出来试试。

src/cps/subway/Subway.ts

@@ -1,23 +1,23 @@
-export type Line = string
-export type Station = string
+export type LineId = string
+export type StationId = string
+
 export type Position = string
 
+export type Line = {
+  id: LineId
+  stations: Array<StationId>
+}
+
+export type Station = {
+  id: StationId
+  lines: Set<LineId>
+  position: Position
+}
 
 export type Subway = {
-  name: string,
-  lineMap: Map<
-    Line,
-    {
-      stations: Array<Station>
-    }
-  >
-  stationMap: Map<
-    Station,
-    {
-      lines: Set<Line>
-      position: Position
-    }
-  >
+  name: string
+  lineMap: Map<LineId, Line>
+  stationMap: Map<StationId, Station>
 }
 
 export function createSubway(name: string): Subway {

src/cps/subway/index.ts

@@ -1,3 +1,3 @@
-export * from "./Subway.js"
 export * from "./defineLine.js"
 export * from "./defineStation.js"
+export * from "./Subway.js"