Create 802-find-eventual-safe-states.js

Author: everthis

802-find-eventual-safe-states.js

@@ -0,0 +1,26 @@
+/**
+ * @param {number[][]} graph
+ * @return {number[]}
+ */
+const eventualSafeNodes = function(graph) {
+  const n = graph.length, memo = {}, visited = new Set(), res = []
+  for(let i = 0; i < n; i++) {
+    if(!dfs(graph, i, memo, visited)) res.push(i)
+  }
+  return res
+};
+
+function dfs(graph, node, memo, visited) {
+  if(memo[node] != null) return memo[node]
+  let hasCycle = false
+  visited.add(node)
+  for(let e of graph[node]) {
+    if(visited.has(e) || dfs(graph, e, memo, visited)) {
+      hasCycle = true
+      break
+    }
+  }
+  visited.delete(node)
+  memo[node] = hasCycle
+  return hasCycle
+}