qq_30339595的博客

"""# Definition for a Node.class Node: def __init__(self, val, neighbors): self.val = val self.neighbors = neighbors"""class Solution: def cloneGraph(self, node: 'Node') -&...

you are offered a list of words and an initial word and a destination word.your task is to change a letter at a time and reach the end word.when I see this question,BFS suddenly bump upon me.but ther...

1.边界2.是否走过 vis3.是否可行