题目链接:[http://acm.hdu.edu.cn/showproblem.php?pid=5952] 题意:给出一张无向图,然后判断这张图中一共有多少个不同的大小为S的完全图,并且保证每个点的度不大于20. 题解:好吧,比赛的时候想太多了,结果时间刚不住,TTTT.正解其实很简单,就一个DFS.每次建立DFS(u),表示u在的大小为S的完全图个数,为了保证不重复,我们只建立单向边.每层DFS的时候,取一个点,当且仅的这个点与之前的所有点选过的点有边相连(神优化).总复杂度是100 * 10…

Counting Cliques HDU - 5952 OJ-ID: hdu-5952 author:Caution_X date of submission:20191110 tags:dfs,graph description modelling:给定点数,边数,问包含有x个点的完全图种类数 major steps to solve it:(1)选择一个点作为起点,记录该起点的所有连通点,dfs(该点)此时完全图有两个点(2)遍历(1)中选定点的连通点,若构成完全图,则dfs(能够与(1)的…

分别给出1,2,3,4   a, b, c,d个 问能否组成数个长度不小于3的等差数列. 首先数量存在大于3的可以直接拿掉,那么可以先判是否都是0或大于3的 然后直接DFS就行了,但是还是要注意先判合法能否进入下层递归来减少内存消耗. /** @Date : 2017-09-27 15:08:23 * @FileName: HDU 5143 DFS.cpp * @Platform: Windows * @Author : Lweleth (SoungEarlf@gmail.com) * @Lin…

Snacks HDU 5692 dfs序列+线段树 题意 百度科技园内有n个零食机,零食机之间通过n−1条路相互连通.每个零食机都有一个值v,表示为小度熊提供零食的价值. 由于零食被频繁的消耗和补充,零食机的价值v会时常发生变化.小度熊只能从编号为0的零食机出发,并且每个零食机至多经过一次.另外,小度熊会对某个零食机的零食有所偏爱,要求路线上必须有那个零食机. 为小度熊规划一个路线,使得路线上的价值总和最大 输入输出: 输入数据第一行是一个整数T(T≤10),表示有T组测试数据. 对于每组数据,…

Counting Cliques Time Limit: 8000/4000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 539    Accepted Submission(s): 204 Problem Description A clique is a complete graph, in which there is an edge between every pair…

题目:题目链接 思路:这道题vj上Time limit:4000 ms,HDU上Time Limit: 8000/4000 MS (Java/Others),且不考虑oj测评机比现场赛慢很多,但10月5号的计蒜客重现赛只给了1000ms确实有点过分吧,好久没有做这种简单dfs做到自闭了,,,题目并不难,注意剪枝就好了,建图时建标号小的点指向标号大的点的单向边,这样按标号从小到大搜一遍就好了,完全图的任意两个点都要有边,按点的标号搜到第n-s+1个点,因为后面所有的点加起来都组不成点数为s的完全子…

A clique is a complete graph, in which there is an edge between every pair of the vertices. Given a graph with N vertices and M edges, your task is to count the number of cliques with a specific size S in the graph.  InputThe first line is the number…

题目: A clique is a complete graph, in which there is an edge between every pair of the vertices. Given a graph with N vertices and M edges, your task is to count the number of cliques with a specific size S in the graph. Input: The first line is the n…

Counting Cliques Time Limit: 8000/4000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1855    Accepted Submission(s): 735 Problem Description A clique is a complete graph, in which there is an edge between every pai…

1.HDU 5877  Weak Pair 2.总结:有多种做法,这里写了dfs+线段树(或+树状树组),还可用主席树或平衡树,但还不会这两个 3.思路:利用dfs遍历子节点,同时对于每个子节点au,查询它有多少个祖先av满足av<=k/au. (1)dfs+线段树 #include<iostream> #include<cstring> #include<cmath> #include<queue> #include<algorithm>…