楠海

摘要： 这个题不会做 class Node: def __init__(self, val=0, neighbors=None): self.val = val self.neighbors = neighbors if neighbors is not None else [] class Solutio 阅读全文

摘要： 这个是逆波兰表达式(其中python3执行,否则会出现计算错误) class Solution(object): def evalRPN(self, tokens): """ :type tokens: List[str] :rtype: int """ operation_list = ("+", 阅读全文