题意:给你一张带权有向图,问你某个点集中,两两结点之间的最短路的最小值是多少. 其实就是dijkstra,只不过往堆里塞边的时候,要注意塞进去它是从集合中的哪个起始点过来的,然后在更新某个点的答案的时候,如果它是集合中的点,除了最开始入堆的那次以外,要再更新一遍,并且不能用从本身过来的路径进行更新. std虽然跑了20次dijkstra,但是还是有一些可取之处. 将一个集合中的每个数进行二进制拆分,然后枚举每一位,将该位为0的归入一个半,再将该位为1的归入另一半.这样划分log次,每次只取跨越两…

Senior Pan Time Limit: 12000/6000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 1411    Accepted Submission(s): 558 Problem Description Senior Pan fails in his discrete math exam again. So he asks Master ZKC to g…

题意 给定一个有 \(N\) 个点 \(M\) 条边的无向图, 每条无向边 最多只能经过一次 . 对于边 \((u, v)\) , 从 \(u\) 到 \(v\) 的代价为 \(a\) , 从 \(v\) 到 \(u\) 的代价为 \(b\) , 其中 \(a\) 和 \(b\) 不一定相等. 求一个包含 \(1\) 号点的有向环, 使得环上代价之和最小. \(N \le 3 \times 10^4 , M \le 10^5 , 1 \le a, b \le 10^4\) , 保证没有重边和自环…

学长好久之前讲的,本来好久好久之前就要写题解的,一直都没写,懒死_(:з」∠)_ Senior Pan Time Limit: 12000/6000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 1332    Accepted Submission(s): 533 Problem Description Senior Pan fails in his discrete ma…

Senior Pan fails in his discrete math exam again. So he asks Master ZKC to give him graph theory problems everyday. The task is simple : ZKC will give Pan a directed graph every time, and selects some nodes from that graph, you can calculate the mini…

Senior Pan Time Limit: 12000/6000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others) Problem DescriptionSenior Pan fails in his discrete math exam again. So he asks Master ZKC to give him graph theory problems everyday.The task is simple :…

题目链接 Problem Description Senior Pan fails in his discrete math exam again. So he asks Master ZKC to give him graph theory problems everyday.The task is simple : ZKC will give Pan a directed graph every time, and selects some nodes from that graph, yo…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2544 题目分析:比较简单的最短路算法应用.题目告知起点与终点的位置,以及各路口之间路径到达所需的时间,要求输出起点到终点的最短时间. /* 最短路 Time Limit: 5000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 35043 Accepted Submission…

图论中一个经典问题就是求最短路.最为基础和最为经典的算法莫过于 Dijkstra 和 Floyd 算法,一个是贪心算法,一个是动态规划.这也是算法中的两大经典代表.用一个简单图在纸上一步一步演算,也是非常好理解的.理解透自己多默写几次就可以记住,机试时基本的工作往往就是高速构造邻接矩阵了. 对于平时的练习,一个非常厉害的 ACMer  @BenLin_BLY 说:"刷水题能够加快我们编程的速度,做经典则能够让我们触类旁通,初期假设遇见非常多编不出.最好还是就写伪代码,理思路.在纸上进行总体分析和…

Problem Description Whuacmers use coins.They have coins of value A1,A2,A3...An Silverland dollar. One day Hibix opened purse and found there were some coins. He decided to buy a very nice watch in a nearby shop. He wanted to pay the exact price(witho…