t_zht的博客

思路：如果target与当前值的差值不在字典中，则将当前值与下标存放在字典里。           如果target与当前值的差值在HashMap中，则返回结果。 class Solution: def twoSum(self, nums, target): dict={} for i in range(len(nums)): x

其实是模拟四则运算，刚开始很不明白关于ListNode 的问题#Definition for singly-linked list. #class ListNode(object): # def __init__(self, x): # self.val = x # self.next = None class Solution(object): def ad

To solve this problem, we need to understand "What is the use of median". In statistics, the median is used for dividing a set into two equal length subsets, that one subset is always greater than th

class Solution(object): def lengthOfLongestSubstring(self, s): dict={} res=0 start=0 for i,ch in enumerate(s): if ch in dict: res=max(re