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<!DOCTYPE html><html lang="zh-CN" data-theme="light"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"><title>瑜璟博客 - 欢迎回来</title><meta name="keywords" content="关键词"><meta name="author" content="瑜璟"><meta name="copyright" content="瑜璟"><meta name="format-detection" content="telephone=no"><meta name="theme-color" content="#ffffff"><meta name="description" content="且行且珍惜">
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这次的题目是北航出的，题目质量确实不错，最后依旧是一题一牌的局面，写5题稳拿银，写六题就能拿金了，无奈我们队没有学换根dp，没有写出mex树(其实ac了改了好久的水管题之后就没多少时间了)，最后dfs过水管那题还挺意外的，原因是memet超时还有一堆细节错误。当然开集合那道题的时候也卡住了，不知道当时怎么想的，把罚时直接拉到600多。最后过了5题，拿了银牌，只能说再接再厉吧。至少证明我们没有白学一年，但区域赛名额怕是不用想了，其实去了也只有打铁的份。
</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2022/09/18/55/" title="icpc网络赛第一场 H Step Debugging"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://yujingsea-picturebed.oss-cn-nanjing.aliyuncs.com/imgbed/code.jpg" onerror="this.onerror=null;this.src='https://yujingsea-picturebed.oss-cn-nanjing.aliyuncs.com/imgbed/404.jpg'" alt="icpc网络赛第一场 H Step Debugging"></a></div><div class="recent-post-info"><a class="article-title" href="/2022/09/18/55/" title="icpc网络赛第一场 H Step Debugging">icpc网络赛第一场 H Step Debugging</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2022-09-18T12:12:16.000Z" title="发表于 2022-09-18 20:12:16">2022-09-18</time></span></div><div class="content">H Step Debugging思路：把repeat看作（，library看作1，arithmetic忽略，for看作 ） ，乘上的是数字字符串，读到fin结束，在加上亿些小细节大致可以把原串处理成一个带有+- （）运算符的数字表达式，然后计算的表达式结果就是答案，计算模板可以参考*基本计算器III（力扣的付费题），赛后代码如下：
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566#include<bits/stdc++.h>#define int long longusing namespace std;const int mod=20220911;//注意取模int calculate(string s) { int n = s.size(), num = 0, curRes = 0, res = 0; char op = '+'; for (int i ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2022/09/08/54/" title="树上的一些基本操作"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://yujingsea-picturebed.oss-cn-nanjing.aliyuncs.com/imgbed/code.jpg" onerror="this.onerror=null;this.src='https://yujingsea-picturebed.oss-cn-nanjing.aliyuncs.com/imgbed/404.jpg'" alt="树上的一些基本操作"></a></div><div class="recent-post-info"><a class="article-title" href="/2022/09/08/54/" title="树上的一些基本操作">树上的一些基本操作</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2022-09-08T13:32:51.000Z" title="发表于 2022-09-08 21:32:51">2022-09-08</time></span></div><div class="content">树的直径（树的最长路）1.两次dfs找两端（无负边权）12345678910111213141516171819202122232425262728293031323334353637383940414243444546#include<bits/stdc++.h>#define int long longusing namespace std;const int N = 1010, M = 1010;int h[N], e[M], w[M], nxt[M], eidx, p, d[N], ans;void add(int u, int v, int weight){ // 添加有向边 u->v, 权重为weight e[eidx] = v; // 记录边的终点 w[eidx] = weight; // 记录边的权重 nxt[eidx] = h[u]; // 将下一条边指向结点u此时的第一条边 h[u] = eidx; ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2022/08/17/53/" title="湖边夜宴"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://yujingsea-picturebed.oss-cn-nanjing.aliyuncs.com/imgbed/happy.jpg" onerror="this.onerror=null;this.src='https://yujingsea-picturebed.oss-cn-nanjing.aliyuncs.com/imgbed/404.jpg'" alt="湖边夜宴"></a></div><div class="recent-post-info"><a class="article-title" href="/2022/08/17/53/" title="湖边夜宴">湖边夜宴</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2022-08-17T09:07:04.000Z" title="发表于 2022-08-17 17:07:04">2022-08-17</time></span></div><div class="content">当夜晚拉下黑色的帷幕，湖边吹来一阵阵潮湿的风，小雨消解了夏日的酷暑，城市的灯光自湖对岸投射过来，一场”年轻人”的宴会已然坐满了同乡人。这是上班族们难得的惬意时光，是学生们繁重学业下的放松之处，我们在湖边欢歌畅饮说笑，谈论着自由与教育。这毕竟是一个黄金时代，长辈们的话题多是近年来的热点时政，以及投射在年轻人身上的希望。我们的心自然是十分年轻的，就像初生的朝阳，但我很敬佩那些游遍五湖四海，看遍社会冷暖心态依旧年轻的人。我想在他们的心里一定有一方伊甸的乐土，那里花开四季，树木常青。
2022.9.4
</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2022/07/29/52/" title="存图的三种方式"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://yujingsea-picturebed.oss-cn-nanjing.aliyuncs.com/imgbed/graph.jpg" onerror="this.onerror=null;this.src='https://yujingsea-picturebed.oss-cn-nanjing.aliyuncs.com/imgbed/404.jpg'" alt="存图的三种方式"></a></div><div class="recent-post-info"><a class="article-title" href="/2022/07/29/52/" title="存图的三种方式">存图的三种方式</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2022-07-29T09:11:37.000Z" title="发表于 2022-07-29 17:11:37">2022-07-29</time></span></div><div class="content">存图的三种方式邻接矩阵空间复杂度过高
123456789101112#include<bits/stdc++.h>const int V = 1000; //最大顶点数int mat[maxn][maxn];//开设二维数组来存矩阵int main(){ int i,j,w; memset(mat, 0, sizeof(mat)); //初始化操作假设权值为0表示没有该边 scanf("%d%d%d",&i,&j,&w);//输入边的信息：起点、终点、权重 mat[i][j] = w;// //增加顶点i到顶点j的权值为w的边 mat[i][j] = 0;//删除边 printf("%d",mat[i][j]);//查询边}
邻接表内存利用率较高，但重边不好处理
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