Update 2050-parallel-courses-iii.js

Author: everthis

2050-parallel-courses-iii.js

@@ -1,3 +1,48 @@
+/**
+ * @param {number} n
+ * @param {number[][]} relations
+ * @param {number[]} time
+ * @return {number}
+ */
+const minimumTime = function (n, relations, time) {
+  const inDegree = Array(n + 1).fill(0)
+  const graph = {}, dist = Array(n + 1).fill(0)
+  
+  for(const [pre, nxt] of relations) {
+    if(graph[pre] == null) graph[pre] = []
+    graph[pre].push(nxt)
+    inDegree[nxt]++
+  }
+
+  let q = []
+  for(let i = 1;i <=n;i++) {
+    if(inDegree[i]===0) {
+      q.push(i)
+      dist[i] = time[i - 1]
+    }
+  }
+  while(q.length) {
+    const size = q.length, nxt = []
+
+    for(let i = 0; i < size; i++) {
+      const cur = q[i]
+      for(const e of (graph[cur] || [])) {
+        dist[e] = Math.max(dist[e], dist[cur] + time[e - 1])
+        inDegree[e]--
+        if(inDegree[e] === 0) {
+          nxt.push(e)
+        }
+      }
+    }
+
+    q = nxt
+  }
+
+  return Math.max(...dist)
+}
+
+// another
+
 /**
  * @param {number} n
  * @param {number[][]} relations