题目链接 \(Description\) 给定集合\(S=\{a_1,a_2,\ldots,a_n\}\),集合中两点之间有边当且仅当\(a_i|a_j\)或\(a_j|a_i\). 求\(S\)最大的一个子集\(S'\),并满足\(S'\)中任意两点间都有连边(\(S'\)中只有1个点也是合法的). \(n,a_i\leq 10^6\),\(a_i\)互不相同. \(Solution\) 从小到大选(已经排好序),如果选了\(a_i\),则下一个数一定是\(a_i\)的倍数,下下个数一定是下个…

http://codeforces.com/problemset/problem/566/F 题目大意: 有n个点,点上有值a[i], 任意两点(i, j)有无向边相连当且仅当 (a[i] mod a[j])==0||(a[j] mod a[i])==0 问这幅图中的最大连通子图是多少. 思路:直接转移,时间复杂度O(n^1.5) #include<cstdio> #include<cmath> #include<cstring> #include<algorit…

http://codeforces.com/contest/566/problem/F F. Clique in the Divisibility Graph time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output As you must know, the maximum clique problem in an arbitrary…

Clique in the Divisibility Graph time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output As you must know, the maximum clique problem in an arbitrary graph is NP-hard. Nevertheless, for some graphs of…

题目链接:http://codeforces.com/contest/219/problem/D 树dp //#pragma comment(linker, "/STACK:102400000, 102400000") #include <algorithm> #include <iostream> #include <cstdlib> #include <cstring> #include <cstdio> #include…

Description The clique problem is one of the most well-known NP-complete problems. Under some simplification it can be formulated as follows. Consider an undirected graph G. It is required to find a subset of vertices C of the maximum size such that…

[CodeForces - 1272D] Remove One Element [线性dp] 标签:题解 codeforces题解 dp 线性dp 题目描述 Time limit 2000 ms Memory limit 262144 kB Source Codeforces Round #605 (Div. 3) Tags brute force   dp   *1500 Site https://codeforces.com/problemset/problem/1272/D 题面 Exam…

题目链接:Codeforces 459E Pashmak and Graph 题目大意:给定一张有向图,每条边有它的权值,要求选定一条路线,保证所经过的边权值严格递增,输出最长路径. 解题思路:将边依照权值排序,每次将同样权值的边同一时候增加,维护每一个点作为终止点的最大长度就可以. #include <cstdio> #include <cstring> #include <algorithm> using namespace std; const int maxn…

http://codeforces.com/contest/459/problem/E 不明确的是我的代码为啥AC不了,我的是记录we[i]以i为结尾的点的最大权值得边,然后wa在第35  36组数据 然后參考答案了,然后----网上一份题解 大意: 给出一个带权有向图,求经过的边权绝对上升的最长路径(可能是非简单路径,就可以能经过一个点多次)所包括的边数. 题解: 对边按权值排序后,从小到大搞. 设q[x]为已经搞过的边组成的以x点为终点的最长路径包括的边数. 设当前边e[i]为从u到v的边,…

题目链接: E. Pashmak and Graph time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Pashmak's homework is a problem about graphs. Although he always tries to do his homework completely, he can't sol…