From c02bd1451f4ee50bb33323e27cd3832b30645b7b Mon Sep 17 00:00:00 2001 From: Anthony Sim Date: Wed, 6 Jul 2022 16:48:51 -0700 Subject: [PATCH] 207 course schedule --- javascript/207-canFinish.js | 38 +++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 javascript/207-canFinish.js diff --git a/javascript/207-canFinish.js b/javascript/207-canFinish.js new file mode 100644 index 000000000..fe02f1f96 --- /dev/null +++ b/javascript/207-canFinish.js @@ -0,0 +1,38 @@ +function createGraph(numCourses, edges) { + const graph = Array.from({ length: numCourses }, () => []); + + for (let edge of edges) { + let [a, b] = edge; + + if (!(a in graph)) graph[a] = []; + if (!(b in graph)) graph[b] = []; + + graph[a].push(b); + } + return graph; +} + +function canFinish(numCourses, preq) { + const graph = createGraph(numCourses, preq); + let seen = new Set(); + let seeing = new Set(); + + function explore(course) { + if (seen.has(course)) return true; + if (seeing.has(course)) return false; + + seeing.add(course); + for (let neighbor of graph[course]) { + if (!explore(neighbor)) return false; + } + + seen.add(course); + seeing.delete(course); + return true; + } + + for (let i = 0; i < numCourses; i++) { + if (!explore(i)) return false; + } + return true; +}; \ No newline at end of file pFad - Phonifier reborn

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