class Solution: def calcEquation(self, equations, values, queries): """ :type equations: List[List[str]] :type values: List[float] :type queries: List[List[str]] :rtype: List[float] """ table = collections.defaultdict(dict) for (x, y), value in zip(equations, values): table[x]...
思路:这道题非常简单,利用Python的切片很容易的将转为str类型的整数反转,只需要判断符号,负数就在反转之后的数字加上负号。本题的坑就在于32位有符号整数,在返回值时不能越界。 class Solution: def reverse(self, x): """ :type x: int :rtype: int """ if x > 0: nums = str(x)[::-1] else...
The input is always valid. You may assume that evaluating the queries will result in no division by zero and there is no contradiction. 给一些有结果的除法等式,又给了一些除法式子要查询结果,根据已知除法等式求结果,没有答案的返回-1。 解法1:Graph,Image a/b = k as a link between node a and...
来源:https://leetcode.com/problems/nim-game/ solution classSolution(object):defcanWinNim(self, n):""" :type n: int :rtype: bool """return(n %4!=0)
对应的 Java 仓库的地址,传送门:https://github.com/liweiwei1419/LeetCode-Solution-Java 说明:现在刷题,尤其是写题解,绝大多数问题都会写两个语言的代码,Java 是我的母语,Python 是我的新欢。 发布在 LeetCode 中文版上的题解配图使用的 PPT,传送门:https://github.com/liweiwei1419/LeetCode-Solution-PPT...
35%的用户# 内存消耗：14.9 MB, 在所有 Python3 提交中击败了67.79%的用户classSolution:defreverse...
看分布的宽度和形状都很类似，只是中心有个偏移，我觉得只能有一个解释：Java对于Python有一个系统性的...
This repository contains the solutions and explanations to the algorithm problems on LeetCode. Only medium or above are included. All are written in C++/Python and implemented by myself. The problems attempted multiple times are labelled with hyperlinks.
return [i,j] 但是报错了(还是本人基本语法掌握不好) 经查阅后 错误消息"TypeError: ‘int’ object is notiterable"通常在Python中出现,当您尝试像遍历(循环)可迭代对象一样遍历整数(int)值时,比如列表、元组或字符串等时会出现此错误。在Python中,您只能遍历支持迭代的对象,如序列和集合。总的来看:列表、字典...
# 递归(优化)# Definition for a binary tree node.# class TreeNode:# def __init__(self, x):# self.val = x# self.left = None# self.right = NoneclassSolution:defrob(self,root:TreeNode)->int:# 存储计算过的结果hash_map={}defhelper(root):ifnotroot:return0# 如果存在于哈希表中,直接...