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LeetCode daily problems
2831. Find the Longest Equal Subarray 🟠 05-23-2024Description:You are given a 0-indexed integer array nums and an integer k.A subarray is called equal if all of its elements are equal. Note that the empty subarray is an equal subarray.Return the l...…
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Software Interview problems
Core JavaSolid PrinciplesSingle Responsibility Principle A class should have one and only one reason to change, meaning that a class should have only one job. Example:Suppose you have a shape class, like triangle, you want to have a method...…
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HTTP
HTTPHTTP based on TCP/IP, it is a protocol used for transmitting web pages over the internet. It is a stateless protocol, which means it does not remember the previous state of the client.HTTP RequestHTTP Request is a message sent from the client ...…
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Network - RPC, HTTP, gRPC
RPC (Remote Procedure Call)What is RPC?RPC is a protocol used to call other processes on the remote systems like a local system. (remote invocation) Beside HTTP, this is another way to achieve communication in distributed systems.Transport protoco...…
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Network - What happend when you type a URL in browser
What happend when you type a URL in browser Check url is valid or not Check browser cache, system cache, router cache, ISP cache, if cache hit, return the page, else go to step 3 DNS resolve, get IP address Browser send H...…
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Network - TCP/IP Model / HTTP
OSI VS TCP/IPOSI stand for Open System Interconnection, which is a conceptual model. It is used to describe the functions of a networking system.TCP/IP is a practicial implementation of the OSI model. It is a protocol stack used for communication ...…
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Prefix Sum problems
Prefix Sum problems LeetCode 难度 724. Find Pivot Index 🟢 560. Subarray Sum Equals K 🟡 724. Find Pivot IndexDescriptionGiven an array of integers nums, calculate the pivot index of this ar...…
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Water trapper problems
接雨水问题详解 LeetCode 力扣 难度 11. Container With Most Water 11. 盛最多水的容器 🟠 42. Trapping Rain Water 42. 接雨水 🔴 ———–力扣第 42 题「接雨水」挺有意思，在面试题中出现频率还挺高的，本文就来步步优化，讲解一下这道题。先看一下题目：就是用一个数组表示一...…
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Parentheses problems
Parentheses problemsLeetCode : 20. Valid Parentheses LeetCode Difficulty 20. Valid Parentheses Easy 921. Minimum Add to Make Parentheses Valid Medium 1541. Minimum Insertions to ...…
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Pan cake sorting
烧饼排序 LeetCode 力扣 难度 969. Pancake Sorting 969. 煎饼排序 🟠 ———–力扣第 969 题「煎饼排序」是个很有意思的实际问题：假设盘子上有 n 块面积大小不一的烧饼，你如何用一把锅铲进行若干次翻转，让这些烧饼的大小有序（小的在上，大的在下）？设想一下用锅铲翻转一堆烧饼的情景，其实是有一点限制的，我们每次只能将最上面的若干块饼子翻转：我们的问题是...…
