题意:给出一个图,去除每条边的花费为边的长度,求用最少的花费去除部分边使得图中无圈. 思路:先将所有的边长加起来,然后减去最大生成树,即得出最小需要破坏的篱笆长度. #include <cstdio> #include <iostream> #include <algorithm> #include <cstring> #include <vector> using namespace std; int N, M; // 桩数量,篱笆数量 int…

链接:传送门 题意:有个女巫把猫全部抓走放在一个由 n 个木桩(xi,yi),m 个篱笆(起点终点木桩的编号)围成的法术领域内,我们必须用圣水才能将篱笆打开,然而圣水非常贵,所以我们尽量想降低花费来解救所有的猫 思路:这张图的生成树相当于这个领域的"框架",总的周长是一定的,只需要让"框架"最长那么其他篱笆(解救猫咪"开口"的地方)也就最短,只需要把边权处理成负数然后做最小生成树,最后 周长 + 最小生成树的路径长 即为答案 /*********…

Save your cats Time limit 8000 ms Memory limit 131072 kB Problem Description Nicholas Y. Alford was a cat lover. He had a garden in a village and kept many cats in his garden. The cats were so cute that people in the village also loved them. One day,…

Nicholas Y. Alford was a cat lover. He had a garden in a village and kept many cats in his garden. The cats were so cute that people in the village also loved them. One day, an evil witch visited the village. She envied the cats for being loved by ev…

参考:https://blog.csdn.net/it_yuan/article/details/53580756 背景: 之前的博客是不支持上传文章缩略图的,后来新增了此功能,但是发现修改老的文章时,新增的图片没有上传到服务器 仅仅是将图片的名字添加到了数据库 原因: 在修改的时候直接update了: ArticlePost.objects.filter(id=article_id).update(title=title, body=body, column_id=column_id, ava…

转:https://www.cnblogs.com/zywscq/p/5397439.html Model.save(force_insert=False, force_update=False, using=DEFAULT_DB_ALIAS, update_fields=None) id和pk 如果一个model里没有显示声明哪一个字段(field)是主键(即在某个字段里声明primary_key=True),则django会自动生成一个名为id的AutoFields作为主键.model里的主…

方法1 下图1-1中提示就是说明了破解的时候权限不足导致,解决办法就是使用管理员权限打开loadrunner破解就好了,但是右键“以管理员身份运行”选项打开loadrunner又是会提示1-2中的问题 1-1 1-2 出现图中的问题是因为当前使用的用户权限不足导致,在安装win10系统的时候,建立的用户实际上不是Administrator,因为微软为了系统安全,隐藏了真正的Administrator,这个真的的管理员需要手动启动,启动方法就是:控制面板-管理工具-双击[计算机管理]-双击[本地用…

Prime Number Time limit 1000 ms Memory limit 131072 kB Problem Description Write a program which reads an integer n and prints the number of prime numbers which are less than or equal to n. A prime number is a natural number which has exactly two dis…

GCD and LCM Time limit 1000 ms Memory limit 131072 kB Problem Description Write a program which computes the greatest common divisor (GCD) and the least common multiple (LCM) of given a and b. Input Input consists of several data sets. Each data set…

Marked Ancestor Time limit 8000 ms Memory limit 131072 kB Problem Description You are given a tree T that consists of N nodes. Each node is numbered from 1 to N, and node 1 is always the root node of T. Consider the following two operations on T: M v…