DFS Tarjans Algorithm Python3 Clean & Intuitive
Python3:\n\nclass Solution:\n    def criticalConnections(self, n: int, connections: List[List[int]]) -> List[List[int]]:\n        if not connections:\n         
Python3:\n```\nclass Solution:\n    def criticalConnections(self, n: int, connections: List[List[int]]) -> List[List[int]]:\n        if not connections:\n            return []\n        \n        def create_graph(edges):\n            graph = defaultdict(list)\n            for u, v in edges:\n                graph[u].append(v)\n                graph[v].append(u)\n            return graph\n            \n        graph = create_graph(connections)\n        visited = [False for _ in range(n)]\n        counter = 0\n        id_low = defaultdict(dict)\n        critical_connections = []\n        \n        def dfs(node, parent):\n            nonlocal graph, visited, counter, id_low, critical_connections\n            if visited[node]:\n                return\n            visited[node] = True\n            id_low[node][\'id\'] = counter\n            id_low[node][\'low\'] = counter\n            counter += 1\n            for node2 in graph[node]:\n                if node2 == parent:\n                    continue\n                dfs(node2, node)\n                if id_low[node][\'id\'] < id_low[node2][\'low\']:\n                    critical_connections.append([node, node2])\n                id_low[node][\'low\'] = min(id_low[node][\'low\'], id_low[node2][\'low\'])\n        \n        dfs(0, -1)\n        return critical_connections\n```
['Python3']