You are given undirected weighted graph. Find the length of the shortest cycle which starts from the vertex 1 and passes throught all the edges at least once. Graph may contain multiply edges between a pair of vertices and loops (edges from the verte…

Description You are given undirected weighted graph. Find the length of the shortest cycle which starts from the vertex 1 and passes throught all the edges at least once. Graph may contain multiply edges between a pair of vertices and loops (edges fr…

题目链接 题目大意: 给一个无向图, n个点m条边, 每条边有权值, 问你从1出发, 每条边至少走一次, 最终回到点1. 所走的距离最短是多少. 如果这个图是一个欧拉回路, 即所有点的度数为偶数. 那么距离就是所有边的长度相加. 当有的点度数为奇数时, 我们可以在两个度数为奇数的点之间连一条边, 距离相当于这两个点之间的最短路. 所以最终答案就是所有边的长度相加+新加的边的长度. 加边的时候用状压dp枚举, 求出最小值. 对于状态s, 如果某一位是1, 表示这个点度数为偶数, 为0表示奇数. 然…

找规律水题... Traveling Cellsperson Time Limit: 1000ms Memory Limit: 65535KB This problem will be judged on UESTC. Original ID: 185264-bit integer IO format: %lld      Java class name: Main Prev Submit Status Statistics Discuss Next Font Size: + - Type:  …

Problem J: Traveling Time Limit: 1 Sec  Memory Limit: 32 MB Description SH likes traveling around the world. When he arrives at a city, he will ask the staff about the number of cities that connected with this city directly. After traveling around a…

Copied From:https://medium.com/basecs/speeding-up-the-traveling-salesman-using-dynamic-programming-b76d7552e8dd   Using dynamic programming to speed up the traveling salesman problem! A large part of what makes computer science hard is that it can be…

1 图论概述 1.1 发展历史 第一阶段: 1736:欧拉发表首篇关于图论的文章,研究了哥尼斯堡七桥问题,被称为图论之父 1750:提出了拓扑学的第一个定理,多面体欧拉公式:V-E+F=2 第二阶段(19~20世纪): 1852: Francis Guthrie提出四色问题 1856: Thomas P. Kirkman & William R.Hamilton研究了哈密尔顿图 1878: Alfred Kempe给出给出四色定理证明 1890: 希伍德(Heawood)推翻原有四色定理证明 1…

TimeWall is a graph databases github It be used to apply mathematic model and social network with graph algorithms and so on... Features: 1. C/S structure 2. compute in memory 3. dynamic add and remove nodes on the graph db 4. with lots of algorithms…

Source: Connected Brain Figure above: Bullmore E, Sporns O. Complex brain networks: graph theoretical analysis of structural and functional systems.[J]. Nature Reviews Neuroscience, 2009, 10(3):186-198. Graph measures A graph G consisting of a set of…

Destroying The Graph Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 8198   Accepted: 2635   Special Judge Description Alice and Bob play the following game. First, Alice draws some directed graph with N vertices and M arcs. After that B…