在介绍Python的self用法之前，先来介绍下Python中的类和实例……我们知道，面向对象最重要的概念就是类（class）和实例（insta...

题目描述 Given a string S and a string T, find the minimum window in S which...

题目描述 Given two words word1 and word2, find the minimum number of steps r...

题目描述 Given two binary trees, write a function to check if they are equal...

题目描述 Merge k sorted linked lists and return it as one sorted list. Analy...

题目描述 Given two words (beginWord and endWord), and a dictionary's word li...

题目描述 Given a non-empty string s and a dictionary wordDict containing a l...

题目描述 Given a linked list, reverse the nodes of a linked list k at a time...