# Definition for a Directed graph node
class DirectedGraphNode:
    def __init__(self, x):
        self.label = x
        self.neighbors = []


class Solution:
    """
    @param graph: A list of Directed graph node
    @return: A list of integer
    """
    def topSort(self, graph):
        # 1. 统计结点入度
        indegree = self.get_indegree(graph …