class Solution {
public:
    ListNode* sortList(ListNode* head) {
        if (head == nullptr || head->next == nullptr) { return head; }
        ListNode* fast = head;
        ListNode* slow = head;
        while (fast->next && fast->next->next) {
            slow = slow->next;
            fast = fast->next->next;
        }
        fast = slow->next;
        slow …

# 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 …