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介绍环信 环信 Web IM SDK 为PC/移动 Web 应用,提供完善的即时通信功能开发能力,屏蔽其内部复杂细节,对外提供较为简洁的 API 接口,方便第三方应用快速集成即时通信功能。 完成功能 环信的SDK集成和配置基本按照官网给的文档就可以实现。本文仅完成了根据用户名互相发收文字信息的功能, 阅读全文
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Easy Reverse a singly linked list. Example: Input: 1->2->3->4->5->NULL Output: 5->4->3->2->1->NULL Follow up: A linked list can be reversed either ite 阅读全文
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Medium Given a positive integer n, break it into the sum of at least two positive integers and maximize the product of those integers. Return the maxi 阅读全文
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Medium Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corne 阅读全文
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Easy You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stoppi 阅读全文
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Medium Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom. 阅读全文