import rustworkx as rx

digraph = rx.PyDiGraph()
nodes = ["a", "b", "c", "d", "e"]
value_idx_dict = {node: digraph.add_node(node) for node in nodes}
print(value_idx_dict)
digraph.add_edge(value_idx_dict['a'], value_idx_dict['c'], None)
digraph.add_edge(value_idx_dict['b'], value_idx_dict['c'], None)
digraph.add_edge(value_idx_dict['c'], value_idx_dict['d'], None)
digraph.add_edge(value_idx_dict['d'], value_idx_dict['e'], None)

# 根据节点值获取索引
value_to_find = "c"
if value_to_find in value_idx_dict:
    idx = value_idx_dict[value_to_find]
    print(digraph.predecessors(idx))
    print(digraph.predecessor_indices(idx))

else:
    print(f"Node with value '{value_to_find}' not found.")