本文主要介绍Python中单词字符串的列表(list),找出列表中所有单词中前一个单词首字母和后一个单词尾字母相同,组成最长的单词链方法代码,并且每个单词不能多次使用。
例如:
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words = [ 'giraffe' , 'elephant' , 'ant' , 'tiger' , 'racoon' , 'cat' , 'hedgehog' , 'mouse' ] |
最长的单词链列表:
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[ 'hedgehog' , 'giraffe' , 'elephant' , 'tiger' , 'racoon' ] |
1、用递归方法查找
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words = [ 'giraffe' , 'elephant' , 'ant' , 'tiger' , 'racoon' , 'cat' , 'hedgehog' , 'mouse' ] def get_results(_start, _current, _seen): if all (c in _seen for c in words if c[ 0 ] = = _start[ - 1 ]): yield _current else : for i in words: if i[ 0 ] = = _start[ - 1 ]: yield from get_results(i, _current + [i], _seen + [i]) new_d = [ list (get_results(i, [i], []))[ 0 ] for i in words] final_d = max ([i for i in new_d if len (i) = = len ( set (i))], key = len ) |
输出结果:
['hedgehog', 'giraffe', 'elephant', 'tiger', 'racoon']
2、使用networkx查找
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import networkx as nx import matplotlib.pyplot as plt words = [ 'giraffe' , 'elephant' , 'ant' , 'tiger' , 'racoon' , 'cat' , 'hedgehog' , 'mouse' ] G = nx.DiGraph() G.add_nodes_from(words) for word1 in words: for word2 in words: if word1 ! = word2 and word1[ - 1 ] = = word2[ 0 ]: G.add_edge(word1, word2) nx.draw_networkx(G) plt.show() print (nx.algorithms.dag.dag_longest_path(G)) |
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原文链接:https://www.cjavapy.com/article/370/