​    ​    ​     ​    ​ 南宁2017ICPC总结 第二次到南宁,高铁三个半小时好像没什么感觉了,广西的天气真的是又湿又冷,而且交通也及其不方面,所以对广西的印象也不是很好.这次承办的是广西大学,这次可能是第一次承办没什么经验,所以很多地方体验没有其他赛区的好,但是整体没出什么大差错表现还算是及格的. 有幸大二就参加了第一次acm的区域赛,最正式的感觉算是这次和上次杭州的ccpc,因为都是真正在一个体育馆里面做题,这种气氛比在机房的那些比赛好多了. 说说这次比赛,热身赛不算很…

题意: 找出不能相互访问的点集的集合的元素数量. 思路: 偏序集最长反链裸题. 代码: #include<iostream> #include<cstring> using namespace std; ; int g[maxn][maxn]; int uN,vN; int linker[maxn]; bool used[maxn]; bool dfs(int u) { ; v < vN; v++) if(g[u][v] && !used[v]) { used…

In this problem, we will define a graph called star graph, and the question is to find the minimum distance between two given nodes in the star graph. Given an integer nnn, an n−dimensionaln-dimensionaln−dimensional star graph, also referred to as Sn…

There are nnn rectangles on the plane. The problem is to find the area of the union of these rectangles. Note that these rectangles might overlap with each other, and the overlapped areas of these rectangles shall not be counted more than once. For e…

Let SSS be a sequence of integers s1s_{1}s​1​​, s2s_{2}s​2​​, ........., sns_{n}s​n​​ Each integer is is associated with a weight by the following rules: (1) If is is negative, then its weight is 000. (2) If is is greater than or equal to 10000100001…

You are given a list of train stations, say from the station 111 to the station 100100100. The passengers can order several tickets from one station to another before the train leaves the station one. We will issue one train from the station 111 to t…

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题意:给你一张DAG,让你选取最多的点,使得这些点之间互相不可达. 思路:此问题和最小路径可重复点覆盖等价,先在原图上跑一边传递闭包,然后把每个点拆成两个点i, i + n, 原图中的边(a, b)变成(a, b + n),跑一变网络流, 答案就是n - maxflow; 代码: #pragma GCC optimize(3) #pragma GCC optimize("Ofast") #pragma GCC optimize("inline") #pragma G…

11月24号,我们经过26个小时的火车来到了广西南宁,一场漫长的过程. 24号晚到达南宁,做地铁到达学校,找到住的地方,南宁的天真是让人无奈. 25号,上午去广西大学体育馆报道,然后回去好好整理了一下,中午去学校吃了个饭,三点开始开幕式,在体育馆坐着等开幕式开始,这的天气让我感觉到了南方的温度真的好冷啊,三点开幕式开始,半个小时候热身赛开始了,第一题一道简单的循环查找,由于我跟队友传达题意的时候没有统一而错了两次,最后改了下A了,然后第二题的题意出来了,是道数学题,想了几种方法优化,但是时间都会…

地址:https://nanti.jisuanke.com/t/17314 题目: Three circles C_{a}C​a​​, C_{b}C​b​​, and C_{c}C​c​​, all with radius RR and tangent to each other, are located in two-dimensional space as shown in Figure 11. A smaller circle C_{1}C​1​​ with radius R_{1}R​1…