Warm up Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 90    Accepted Submission(s): 12 Problem Description N planets are connected by M bidirectional channels that allow instant transportatio…

题目链接: Hdu 4612 Warm up 题目描述: 给一个无向连通图,问加上一条边后,桥的数目最少会有几个? 解题思路: 题目描述很清楚,题目也很裸,就是一眼看穿怎么做的,先求出来双连通分量,然后缩点重新建图,用bfs求树的直径,直径的长度就是减去桥的数目. 这个题目需要手动扩展,而且手动扩展的话要用C++提交,G++re哭了. #include <cstdio> #include <queue> #include <cstring> #include <i…

Building Fence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 171    Accepted Submission(s): 25Special Judge Problem Description Long long ago, there is a famous farmer named John. He owns a bi…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=4612 题意:一个包含n个节点m条边的无向连通图(无自环,可能有重边).求添加一条边后最少剩余的桥的数目. 思路:要想尽可能地消灭桥,那么添加的这条边一定是连通了最多的BCC. 所以首先进行双连通分量分解,并记录桥的数目:然后将同属一个BCC的点缩成一个,代之以block序号,以block序号为点将原图重构为一棵树. 最后求树的直径,桥的数目减去树的直径即为答案. 整体框架是学习了 http://w…

Warm up Time Limit:5000MS     Memory Limit:65535KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 4612 Description N planets are connected by M bidirectional channels that allow instant transportation. It's always possible to travel bet…

Y Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 60    Accepted Submission(s): 20 Problem Description   Sample Input 4 1 2 1 3 1 4   Sample Output 1 Hint 1. The only set is {2,3,4}. 2. Please…

Sum Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 94    Accepted Submission(s): 41 Problem Description   Sample Input 2   Sample Output 2 Hint 1. For N = 2, S(1) = S(2) = 1. 2. The input fil…

Editor Time Limit: 3000/2000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 118    Accepted Submission(s): 38 Problem Description   Sample Input 8 I 2 I -1 I 1 Q 3 L D R Q 2   Sample Output 2 3 Hint The following…

Answers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 25    Accepted Submission(s): 16 Problem Description   Sample Input 2 4 2 2 2 1 0 1 2 3   Sample Output NO YES YES YES   Source 2013 Mul…

EBCDIC Time Limit: 2000/2000 MS (Java/Others)    Memory Limit: 102400/102400 K (Java/Others)Total Submission(s): 160    Accepted Submission(s): 81 Problem Description A mad scientist found an ancient message from an obsolete IBN System/360 mainframe.…