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 )
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