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#include <iostream>
using namespace std;
class edge;
class node
{
public:
    int in_degree;
    edge* first;     
}; 
class edge
{
public:
    int value;
    edge* next;
};
class q_node
{
public:
    int value;
    q_node* next;   
};
class q
{
public:
    q_node* head;
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