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Note：Python位运算只作用于整数。整数首先被转换为二进制，然后在每一个位或对应的位组上进行位运算，...
Python regular expression question - sub string but not prepended with :) I'm trying to sub foo to bar, but only if it's not prepended with ie. /. So... foobar should change to barbar, but /foobar not. I've tried to add [^/] at beginning of my re, but that doesn't work...
一、刷题之前的一些准备 如果你连最基本的数据结构,例如链表,队列,栈,二叉树都没有接触过,那么我是不建议你去 leetcode 刷题的,所以我上面先说了先入门一下数据结构与算法,当你学习了这些基础的数据结构之后,其实已经具备了刷题的能力了。 基础数据结构与算法知识: 1、时间复杂度 2、空间复杂度 一般最先接触...
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Can you solve this real interview question? Find Median from Data Stream - The median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value, and the median is the mean of the two middle values. * For
第二次提交存在未定义变量类型的问题,可能是python用多了,在C++中使用过的所有变量都必须提前定义变量类型。 第三次提交循环控制条件用n-wl时,一定是<=,而不是<。 解题思路: 由于所要寻找的子字符串中需要包含目标单词向量中所有次数的单词,而不约束单词出现的顺序。因此采用map结构进行存储比较方便,对应单词出现...
python版的代码一行完事: View Code 383. Ransom Note https://leetcode.com/problems/ransom-note/ 就是用后一个串合成前一个串,条件是后一个串的每个字符只能用一次,这种题都可以利用c++的字符和int型转换来构建一个长为26度数组,每个数组表示一个key(前提是全大写或者全小写)。
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