@[Eason_cyx](/user/741244) io不能直接用的，要实例化才能用 ```python from cyaron import * graph = Graph.UDAG(4, 7) out = IO() out.input_writeln(graph.to_str(output=Edge.unweighted_edge)) ``` by wangziwenhk @ 2024-04-09 16:16:21