Grokking Graph Algorithms for Coding Interviews
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Find Eventual Safe States (medium)
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Problem Statement

You are given a directed graph with n nodes, labeled from 0 to n-1. This graph is described by a 2D integer array graph, where graph[i] is an array of nodes adjacent to node i, indicating there is a directed edge from node i to each of the nodes in graph[i].

A node is called a terminal node if it has no outgoing edges. A node is considered safe if every path starting from that node leads to a terminal node (or another safe node).

Return an array of all safe nodes in ascending order.

Examples

Example 1:

  • Input: graph =

.....

.....

.....

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