Havel--Hakimi定理判断可图化 python

list1 = [ 4, 7, 7, 3, 3, 3, 2, 1 ]
list2 = [ 5, 4, 3, 3, 2, 2, 2, 1, 1, 1 ]

def havel_hakimi_algo( degree_list ):

    degree_list.sort( reverse = True )
    print degree_list
    for degree in degree_list:
        if degree < 0:
            return False
        if degree != 0:
            remove_val = degree_list.pop( 0 )
            for index in range( remove_val ):
                degree_list[index] -= 1
            havel_hakimi_algo( degree_list )
    return True

print havel_hakimi_algo( list1 )
print havel_hakimi_algo( list2 )

Havel--Hakimi定理判断可图化 python