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摘要： You are given a string, s, and a list of words, “words”, that are all of the same length. Find all starting indices of substring(s) in s that is a con... 阅读全文

摘要： Divide two integers without using multiplication, division and mod operator. If it is overflow, return MAX_INT. 思路：实现两个整数的除法，不能使用乘法，除法和移位操作。首先想到的是减法，但 阅读全文

摘要： 一：概述 正则表达式(RE)为高级文本模式匹配，以及搜索-替代等功能提供了基础。正则表达式(RE)是一些由字符和特殊符号组成的字符串，它们能匹配多个字符串。Python通过标准库的re模块支持正则表达式。 在Python中，有两种主要方法完成模式匹配：搜索(searching)和匹配(matchin 阅读全文

摘要： Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space fo 阅读全文

摘要： Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. If the number of nodes is not a multiple of k then l 阅读全文

摘要： Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 思路：要快速找到k个元素中的最小值，使用堆这种数据结构。找到最小值后，还需要知道该最小值出自哪个链表， 阅读全文

摘要： Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is: " 阅读全文

摘要： Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two end p 阅读全文

摘要： Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding elemen 阅读全文

摘要： There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity sh 阅读全文