Create 2050-parallel-courses-iii.js

Author: everthis

2050-parallel-courses-iii.js

@@ -0,0 +1,36 @@
+/**
+ * @param {number} n
+ * @param {number[][]} relations
+ * @param {number[]} time
+ * @return {number}
+ */
+const minimumTime = function(n, relations, time) {
+  const graph = {}, dist = Array(n).fill(0), inDegree = Array(n).fill(0)
+  for(let [from, to] of relations) {
+    from--, to--
+    if (graph[from] == null) graph[from] = []
+    graph[from].push(to)
+    inDegree[to]++
+  }
+  const q = []
+  for(let i = 0; i < n; i++) {
+    if(inDegree[i] === 0) {
+      q.push(i)
+      dist[i] = time[i]
+    }
+  }
+
+  while(q.length) {
+    const u = q.shift()
+    for(const v of (graph[u] || [])) {
+      dist[v] = Math.max(dist[v], dist[u] + time[v])
+      if(--inDegree[v] === 0) q.push(v)
+    }
+  }
+
+  let res = 0
+  for(let e of dist) {
+    if(e > res) res = e
+  }
+  return res
+};