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百万数据导出 Excel 实战:从 OOM 到丝滑落地的完整演进 本文面向有 Java 基础、做过业务开发的同学。我们从“为什么 100 万行导出会 OOM”讲起,逐层递进到 SXSSF、EasyExcel、CSV、游标分页、异步导出,最后给出可直接运行的完整工程代码和面试考点。 目录 先看问题:为
川剧复演 题解 题意 有 n 场演出、m 出剧目。每场选一出剧目,同一剧目可重复选。 合法条件:任意连续 m 场演出中,都存在某剧目出现至少两次。 换句话说,不允许出现"连续 m 场两两不同"。 暴力 DP 状态 把"全局约束"翻译成"局部禁止条件" 合法 ⟺ 不存在长度为 m 的连续子段两两不同。
做特征工程时很多人有一套固定动作:StandardScaler 然后 fit_transform。(也就是先标准化数据,在训练模型) 这在教科书数据集上没问题,但真实数据,比如订单金额、页面停留时长、接口耗时等,几乎天然右偏,还总混着几个离谱的值。 StandardScaler 拿均值和标准差当尺子
读取A文件,然后写入到B文件中 package main import ( "fmt" "io/ioutil" ) func main() { // 读取文件 byteStr, err := ioutil.ReadFile("./testFile.txt") // 如果哦 err 不为 nil,说明
排序是程序员的必修课,也是检验一门新语言的最好切口。 原因很实在。一个排序算法下来,列表、循环、函数、比较运算四样东西全用上了。这四样是日常编码里出现频率最高的基础设施,排序写顺了,这门语言就算摸到门了。 前三篇我们写了 Hello World、配置体检工具、性能测试。这篇换个姿势,用算法来练手。
速度环稳住之后,改目标、看曲线、调系数都顺手了,PID 就够了吗?输出限幅、积分分离、微分先行这些“手术”各自在治什么病,反馈之外又为什么还要请回一路前馈?
every 的介绍(ES6) Array.every() 数组中的所有元素都符合要求,就会返回true,否则返回false。 Array.every(callbackFn(element,index,array){ return 条件判断}) 注意:如果数组为空,返回 true(空数组满足所有条件,
⚠️ 法律与伦理声明:本文所述技术仅适用于您拥有或获得明确书面授权的系统,包括个人实验环境、CTF 比赛、TryHackMe/HackTheBox 等合法靶场。未经授权对他人系统进行密码破解属于违法行为。 一、Kali 自带字典资源:/usr/share/wordlists/ 1.1 目录结构与核心
大家好,我是晓凡 。 就在10月15早上8点左右,DeepSeek崩了。 DeepSeek 网页和App都显示“服务器暂时不可用”大概持续了5小时左右。 一开始我以为是我自己网络问题,一搜原来大家都一样。 然后DeepSeek 崩了就冲上了热搜,今天各种补偿政策就出来了。 下面是DeepSeek官方
Junie Local is supported on the NVIDIA RTX Spark from day one, and Windows support moves from experimental to stable. NVIDIA’s RTX Spark platform pairs a Blackwell RTX GPU with a Grace CPU to run larger local AI models in slim laptops and compact desktops. Junie Local leverages this hardware to bring local AI coding […]
Identity alone doesn't guarantee a bot will behave responsibly. We are introducing a system to continuously evaluate whether Verified bots honor site preferences, like robots.txt and HTTP 429s, ensuring they remain accountable over time.
笛卡尔树 本质 笛卡尔树,就是一棵"递归地用最小值去划分区间"的二叉树。 给定一个序列,不断做这样一件事: 找到整个序列的最小值,把它当作根; 最小值左边的那段子序列,递归建成左子树; 最小值右边的那段子序列,递归建成右子树。 这样得到的树,就是笛卡尔树。它把"区间最小值"这种信息,用树的结构显式地
AI, agents, voice, and physical controls are shifting software development from operating tools to expressing intent—and helping developers stay focused on building. The post The next developer interface is ambient intelligence appeared first on The GitHub Blog.
Put native GitHub features to work to review outside collaborator access and archive stale repositories. The post Staying Evergreen: How we automated secure access and repo hygiene in a shared org appeared first on The GitHub Blog.
Cloudflare Gateway and Data Loss Prevention have inherited the flexibility and power of Cloudflare Workers through our full-stack integration with the Cloudflare Developer platform.
第三章:Details 剩余数据补读 第二章从 Details 页里挑出了三个重点 section,这一章沿着 Details 页往下走,把剩下的 11 个 section 按页面顺序补齐,依次是 PM Sampling、Compute Workload Analysis、Scheduler Sta
Google Summer of Code 2026 has wrapped up! This was the Kotlin Foundation’s fourth year participating in GSoC, bringing new contributors into the Kotlin open-source ecosystem through hands-on projects and mentorship. This year, two projects successfully reached completion, tackling two areas of the ecosystem: improving recursion support in the Kotlin/Wasm backend and building a global […]
Introducing Void: an open-source SDK, CLI, and self-hosted platform for building full-stack Vite apps and deploying them to Cloudflare.
Ten weeks ago, we opened up a preview of an LSP-powered extension that brings IntelliJ IDEA’s smartness for Java and Kotlin into VS Code and Cursor. As mentioned in that blog post, this is part of a bigger initiative: moving our JVM intelligence to wherever our users are, no matter what editor or agent they […]
How Cloudflare and OpenAI are working together to help AI find useful content, keep up with changes, and make fewer wasted requests — making the experience better for users and website owners alike.