hdu4935 Prime Tree(2014多校联合第七场) 首先这是一道dp题,对题意的把握和对状态的处理是解题关键。 题目给出的范围是n在1到1e11之间,由于在裂变过称中左儿子总是父亲节点的一个非平凡约数,容易看出裂变过程只与 素数幂有关,并且显然有素数不超过11个,幂指数不超过40,实际上可以用一个大小为11的数组来等...
走过i时,第i个数不再生效,所以将[i,R[i]]区间-1 1#include<cstdio>2#include<iostream>3#include<string.h>4#include<algorithm>5#include <vector>6usingnamespacestd;7constintN =200000+10;8vector<int>prime[N];9vector<int>cL[N];10inta[N],L[N],R[N];11intmark[N];12inttree[N<<2],...
Problem Description For a tree, which nodes and edges are all weighted, the ratio of it is calculated according to the following equation. Given a complete graph of n nodes with all nodes and edges weighted, your task is to find a tree, which is a sub-graph of the original graph, with...
pid=2489 这道题就是n个点中选择m个点形成一个生成树使得生成树的ratio最小。暴力枚举+最小生成树。 1#include <cstdio>2#include <cstring>3#include <algorithm>4#definemaxn 10005usingnamespacestd;6constintinf=1<<29;7constdoubleeps=1e-8;89intmap[maxn][maxn];10intg[maxn][maxn];11boolvi...
Multi cases is included in the input file. The first line of each case is the size of matrix n, n is a odd number and 3<=n<=9.There are n lines followed, each line contain n integers. It is end of input when n is 0 . ...
HDU 4135 Co-prime(容斥原理) 编程算法数据结构 Co-prime Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3313 Accepted Submission(s): 1286 Problem Description Given a number N, you are asked to count the number of integers between A ...
1016Prime Ring Problem 2809God of War 1043Eight 1667The Rotation Game 1547Bubble Shooter 2216Game III 2364Escape 2822Dogs 1983Kaitou Kid - The Phantom Thief (2) 2821Pusher 2782The Worm Turns 2234无题I 1560DNA sequence 1813Escape from Tetris 2517棋盘分割 2416Treasure of the Chimp Island 1226超级...
HDU2682 Tree 题解 【最小生成树】【图论】【Kruskal】 Problem Description There are N (2<=N<=600) cities,each has a value of happiness,we consider two cities A and B whose value of happiness are VA and VB,if VA is a prime number,or VB is a prime number or (VA+VB) is a ...
Prime Ring Problem HDU - 1016(带回溯的DFS) 回溯法中,首先需要明确下面三个概念: (一)约束函数:约束函数是根据题意定出的。通过描述合法解的一般特征用于去除不合法的解,从而避免继续搜索出这个不合法解的剩余部分。因此,约束函数是对于任何状态空间树上的节点都有效、等价的。 (二)状态空间树:刚刚已经提到,...
A number whose only prime factors are 2,3,5 or 7 is called a humble number. The sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 25, 27, ... shows the first 20 humble numbers. Write a program to find and print the nth element in this...