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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（instance），类是抽象的模板，比如...

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

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

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题目描述 Given two binary trees, write a function to check if they are equal or not.Two bin...

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

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题目描述 Given two words (beginWord and endWord), and a dictionary's word list, find the le...

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题目描述 Given a non-empty string s and a dictionary wordDict containing a list of non-empt...

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

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题目描述 Given a string, sort it in decreasing order based on the frequency of characters. ...

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题目描述 Remove the minimum number of invalid parentheses in order to make the input string...

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题目描述 Suppose an array sorted in ascending order is rotated at some pivot unknown to you...

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题目描述 Given an array of integers, return indices of the two numbers such that they add u...

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Abstract Factory Concreate Facotry - Amex Concreate Amex Credit Card

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Parent Children Factory

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题目描述 Given two strings s and t, write a function to determine if t is an anagram of s.F...

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题目描述 Given a binary tree, find its maximum depth. The maximum depth is the number of no...