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…

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/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…

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…

Mr. Kitayuta's Colorful Graph Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 505B Description Mr. Kitayuta has just bought an undirected graph consisting of n vertices and m edges. The…

A. Divisibility Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/597/problem/A Description Find the number of k-divisible numbers on the segment [a, b]. In other words you need to find the number of such integer values x tha…

C. Graph Reconstruction Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/329/problem/C Description I have an undirected graph consisting of n nodes, numbered 1 through n. Each node has at most two incident edges. For each pa…

http://codeforces.com/problemset/problem/527/D 题意:给出一些点的xi和wi,当|xi−xj|≥wi+wj的时候,两点间存在一条边,找出一个最大的集合,集合中的点两两之间存在边 化开有 xi-xj>=wi+wj ==> wj+xj<=wi-xi xj-xi>=wi+wj ==> wi+wx<=wj-xj 发现本质相同,我们按x+w排序,从最小的往大的贪心连边,因为如果有一条边,那么比它小的也全部可以连到边. #include…

转载请注明出处: http://www.cnblogs.com/fraud/          ——by fraud Mr. Kitayuta's Colorful Graph Mr. Kitayuta has just bought an undirected graph consisting of n vertices and m edges. The vertices of the graph are numbered from 1 to n. Each edge, namely edge…