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  <title>喵喵小窝</title>
  
  
  <link href="https://blog.hikariyo.net/atom.xml" rel="self"/>
  
  <link href="https://blog.hikariyo.net/"/>
  <updated>2026-05-14T17:18:00.000Z</updated>
  <id>https://blog.hikariyo.net/</id>
  
  <author>
    <name>生理盐水</name>
    
  </author>
  
  <generator uri="https://hexo.io/">Hexo</generator>
  
  <entry>
    <title>题解 - 2026 杭电春季联赛 (6)</title>
    <link href="https://blog.hikariyo.net/xcpc/editorial/hdu-spring-06/"/>
    <id>https://blog.hikariyo.net/xcpc/editorial/hdu-spring-06/</id>
    <published>2026-05-13T08:46:00.000Z</published>
    <updated>2026-05-14T17:18:00.000Z</updated>
    
    
    <summary type="html">2026 杭电春季联赛第六场题解。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
  </entry>
  
  <entry>
    <title>题解 - 2026 杭电春季联赛 (5)</title>
    <link href="https://blog.hikariyo.net/xcpc/editorial/hdu-spring-05/"/>
    <id>https://blog.hikariyo.net/xcpc/editorial/hdu-spring-05/</id>
    <published>2026-05-12T12:57:00.000Z</published>
    <updated>2026-05-13T00:19:00.000Z</updated>
    
    
    <summary type="html">2026 杭电春季联赛第五场题解。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
  </entry>
  
  <entry>
    <title>数据结构 - 并查集</title>
    <link href="https://blog.hikariyo.net/xcpc/ds/dsu/"/>
    <id>https://blog.hikariyo.net/xcpc/ds/dsu/</id>
    <published>2026-05-06T15:53:00.000Z</published>
    <updated>2026-05-06T15:53:00.000Z</updated>
    
    
    <summary type="html">记录一些并查集相关算法的正确性证明，不包含复杂度分析。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
    <category term="DS" scheme="https://blog.hikariyo.net/tags/DS/"/>
    
  </entry>
  
  <entry>
    <title>数学 - 异或线性基</title>
    <link href="https://blog.hikariyo.net/xcpc/math/xor-linear-basis/"/>
    <id>https://blog.hikariyo.net/xcpc/math/xor-linear-basis/</id>
    <published>2026-05-05T21:08:00.000Z</published>
    <updated>2026-05-06T10:17:00.000Z</updated>
    
    
    <summary type="html">从向量空间视角整理异或线性基的常用定义、性质和证明。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Math" scheme="https://blog.hikariyo.net/tags/Math/"/>
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
  </entry>
  
  <entry>
    <title>题解 - 2026 杭电春季联赛 (4)</title>
    <link href="https://blog.hikariyo.net/xcpc/editorial/hdu-spring-04/"/>
    <id>https://blog.hikariyo.net/xcpc/editorial/hdu-spring-04/</id>
    <published>2026-04-22T21:17:00.000Z</published>
    <updated>2026-05-12T21:17:00.000Z</updated>
    
    
    <summary type="html">2026 杭电春季联赛第四场题解。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
  </entry>
  
  <entry>
    <title>计算几何 - 凸包</title>
    <link href="https://blog.hikariyo.net/xcpc/geometry/convex-hull/"/>
    <id>https://blog.hikariyo.net/xcpc/geometry/convex-hull/</id>
    <published>2026-04-03T17:39:00.000Z</published>
    <updated>2026-04-03T17:39:00.000Z</updated>
    
    
    <summary type="html">本文主要讲解凸包的定义、性质，以及 Andrew 算法及其正确性。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
    <category term="Geometry" scheme="https://blog.hikariyo.net/tags/Geometry/"/>
    
  </entry>
  
  <entry>
    <title>概率 - 异或哈希</title>
    <link href="https://blog.hikariyo.net/xcpc/prob/xor-hashing/"/>
    <id>https://blog.hikariyo.net/xcpc/prob/xor-hashing/</id>
    <published>2026-03-31T18:49:00.000Z</published>
    <updated>2026-03-31T18:49:00.000Z</updated>
    
    
    <summary type="html">为什么分类是概率？因为本文主要讨论异或哈希算法的正确性，而这个正确性就是基于概率的。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
    <category term="Prob" scheme="https://blog.hikariyo.net/tags/Prob/"/>
    
  </entry>
  
  <entry>
    <title>专题训练 - 贪心 I</title>
    <link href="https://blog.hikariyo.net/xcpc/train/greedy1/"/>
    <id>https://blog.hikariyo.net/xcpc/train/greedy1/</id>
    <published>2026-03-19T20:20:00.000Z</published>
    <updated>2026-04-01T20:26:00.000Z</updated>
    
    
    <summary type="html">若干道带有 Greedy 标签的 CF 题目。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
    <category term="Greedy" scheme="https://blog.hikariyo.net/tags/Greedy/"/>
    
  </entry>
  
  <entry>
    <title>专题训练 - 博弈 I</title>
    <link href="https://blog.hikariyo.net/xcpc/train/games1/"/>
    <id>https://blog.hikariyo.net/xcpc/train/games1/</id>
    <published>2026-03-12T21:05:00.000Z</published>
    <updated>2026-03-19T15:17:00.000Z</updated>
    
    
    <summary type="html">若干道带有 Games 标签的 CF 题目。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
    <category term="Games" scheme="https://blog.hikariyo.net/tags/Games/"/>
    
  </entry>
  
  <entry>
    <title>图论 - 欧拉回路</title>
    <link href="https://blog.hikariyo.net/xcpc/graph/euler-tour/"/>
    <id>https://blog.hikariyo.net/xcpc/graph/euler-tour/</id>
    <published>2026-03-11T15:47:00.000Z</published>
    <updated>2026-03-11T16:18:00.000Z</updated>
    
    
    <summary type="html">本文主要证明求解欧拉回路的 Hierholzer 算法的正确性。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
    <category term="Graph" scheme="https://blog.hikariyo.net/tags/Graph/"/>
    
  </entry>
  
  <entry>
    <title>题解 - Codeforces Round 1077 (Div. 2)</title>
    <link href="https://blog.hikariyo.net/xcpc/editorial/cf-round-1077/"/>
    <id>https://blog.hikariyo.net/xcpc/editorial/cf-round-1077/</id>
    <published>2026-02-24T17:39:00.000Z</published>
    <updated>2026-02-24T17:39:00.000Z</updated>
    
    
    <summary type="html">Codeforces Round 1077 (Div. 2) 部分题解。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
  </entry>
  
  <entry>
    <title>题解 - Codeforces Round 1078 (Div. 2)</title>
    <link href="https://blog.hikariyo.net/xcpc/editorial/cf-round-1078/"/>
    <id>https://blog.hikariyo.net/xcpc/editorial/cf-round-1078/</id>
    <published>2026-02-20T18:23:00.000Z</published>
    <updated>2026-02-20T18:23:00.000Z</updated>
    
    
    <summary type="html">Codeforces Round 1078 (Div. 2) 部分题解。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
  </entry>
  
  <entry>
    <title>数学 - FWT</title>
    <link href="https://blog.hikariyo.net/xcpc/math/fast-walsh-trans/"/>
    <id>https://blog.hikariyo.net/xcpc/math/fast-walsh-trans/</id>
    <published>2026-02-20T14:54:00.000Z</published>
    <updated>2026-02-20T14:54:00.000Z</updated>
    
    
    <summary type="html">FWT 公式推导与板子。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Math" scheme="https://blog.hikariyo.net/tags/Math/"/>
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
  </entry>
  
  <entry>
    <title>专题训练 - 构造 II</title>
    <link href="https://blog.hikariyo.net/xcpc/train/cons2/"/>
    <id>https://blog.hikariyo.net/xcpc/train/cons2/</id>
    <published>2026-02-07T15:30:00.000Z</published>
    <updated>2026-02-18T01:30:00.000Z</updated>
    
    
    <summary type="html">10 道带有 Constructive 标签的 CF 题目。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
    <category term="Constructive" scheme="https://blog.hikariyo.net/tags/Constructive/"/>
    
  </entry>
  
  <entry>
    <title>数学 - 初等数论选讲</title>
    <link href="https://blog.hikariyo.net/xcpc/math/number-theory/"/>
    <id>https://blog.hikariyo.net/xcpc/math/number-theory/</id>
    <published>2026-02-06T16:02:00.000Z</published>
    <updated>2026-02-06T16:02:00.000Z</updated>
    
    
    <summary type="html">从最小数原理和数学归纳法出发的初等数论的最基本内容。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Math" scheme="https://blog.hikariyo.net/tags/Math/"/>
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
  </entry>
  
  <entry>
    <title>数学 - 中国剩余定理</title>
    <link href="https://blog.hikariyo.net/xcpc/math/crt/"/>
    <id>https://blog.hikariyo.net/xcpc/math/crt/</id>
    <published>2026-02-03T15:18:00.000Z</published>
    <updated>2026-02-03T15:18:00.000Z</updated>
    
    
    <summary type="html">本文主要记录 exCRT 的数学推导。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Math" scheme="https://blog.hikariyo.net/tags/Math/"/>
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
  </entry>
  
  <entry>
    <title>专题训练 - 构造 I</title>
    <link href="https://blog.hikariyo.net/xcpc/train/cons1/"/>
    <id>https://blog.hikariyo.net/xcpc/train/cons1/</id>
    <published>2026-01-30T16:23:00.000Z</published>
    <updated>2026-01-31T20:22:00.000Z</updated>
    
    
    <summary type="html">10 道带有 Constructive 标签的 CF 题目。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
    <category term="Constructive" scheme="https://blog.hikariyo.net/tags/Constructive/"/>
    
  </entry>
  
  <entry>
    <title>字符串 - SAM</title>
    <link href="https://blog.hikariyo.net/xcpc/string/sam/"/>
    <id>https://blog.hikariyo.net/xcpc/string/sam/</id>
    <published>2025-12-25T15:40:00.000Z</published>
    <updated>2025-12-25T15:40:00.000Z</updated>
    
    
    <summary type="html">后缀自动机的应用。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
    <category term="String" scheme="https://blog.hikariyo.net/tags/String/"/>
    
  </entry>
  
  <entry>
    <title>数学 - 多项式</title>
    <link href="https://blog.hikariyo.net/xcpc/math/poly/"/>
    <id>https://blog.hikariyo.net/xcpc/math/poly/</id>
    <published>2025-12-22T18:14:00.000Z</published>
    <updated>2025-12-22T18:14:00.000Z</updated>
    
    
    <summary type="html">使用了多项式加速计算的题目。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Math" scheme="https://blog.hikariyo.net/tags/Math/"/>
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
  </entry>
  
  <entry>
    <title>数学 - 生成函数基础</title>
    <link href="https://blog.hikariyo.net/xcpc/math/generating-functions/"/>
    <id>https://blog.hikariyo.net/xcpc/math/generating-functions/</id>
    <published>2025-12-15T12:14:00.000Z</published>
    <updated>2025-12-15T12:14:00.000Z</updated>
    
    
    <summary type="html">不包含 FFT/NTT 的基础生成函数题目。</summary>
    
    
    
    <category term="XCPC" scheme="https://blog.hikariyo.net/categories/XCPC/"/>
    
    
    <category term="Math" scheme="https://blog.hikariyo.net/tags/Math/"/>
    
    <category term="Algo" scheme="https://blog.hikariyo.net/tags/Algo/"/>
    
    <category term="C++" scheme="https://blog.hikariyo.net/tags/C/"/>
    
  </entry>
  
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