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Hello 大家好！ 决定开一个国内的包子培训的博客，因为发现blogger在国内是被屏蔽的，Youtube早已被屏蔽，然后优酷实在是太沙雕了，基本处于一种不可用的状态，所以果断转向B站 (对于一个中年大龄程序员来说通过b站的二次元考试实在是不容易啊。。。), 以后主要通过这里来跟大家交流。大家如果 阅读全文
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Problem Statement Design a food rating system that can do the following: Modify the rating of a food item listed in the system. Return the highest-rat 阅读全文
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Problem Statement There is a street with n * 2 plots, where there are n plots on each side of the street. The plots on each side are numbered from 1 t 阅读全文
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Problem Statement You are given a 0-indexed m x n integer matrix grid consisting of distinct integers from 0 to m * n - 1. You can move in this matrix 阅读全文
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Problem Statement Given an array nums, return true if the array was originally sorted in non-decreasing order, then rotated some number of positions ( 阅读全文
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Problem Statement Given two numbers, hour and minutes. Return the smaller angle (in degrees) formed between the hour and the minute hand. Example 1: I 阅读全文
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Problem Statement Given an array of integers nums. A pair (i,j) is called good if nums[i] == nums[j] and i < j. Return the number of good pairs. Examp 阅读全文
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Methodology: READ MF! [Originally from the Post: System design interview: how to design a chat system (e.g., Facebook Messenger, WeChat or WhatsApp)] 阅读全文
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Problem Statement You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed. All houses at 阅读全文
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Problem Statement You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only cons 阅读全文
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Problem Statement Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by 阅读全文