Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 40069 Accepted Submission(s): 17675 Problem Description A ring is compose of n circles as shown in diagram. Put natural number 1,…

hdu1015:给定一串可用序列值,每个字符映射到一个1-26之间的整数,选择五个有序数使得满足 a-b2+c3-d4+e5=target. #include<iostream> #include<cstdio> #include<string.h> #include<algorithm> #include<map> using namespace std; int target; ]; ]; map<char,int>mp; ],c…

刷回溯的时候发现我对DFS思路很不清晰,总是做着做着就乱了,刷个水题找找思路. 题意:经典DFS,找出所有的能让1~n的数形成素数环的序列(相邻相加为素数): #include <iostream> #include <cmath> #include <cstdio> #include <cstring> #include <cstdlib> #include <string> #include <sstream> #in…

dfs,用全局数组和变量保存并更新当前状态. 答案可以直接在搜索结束时打印,n为奇数时方案数为0. acm.hdu.edu.cn/showproblem.php?pid=1016 #include <cstdio> #include <cstring> using namespace std; ; int n; int ans[maxn], k; ]; ]; void init(){ memset(isprime, , sizeof isprime); isprime[] = is…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 34609    Accepted Submission(s): 15327 Problem Description A ring is compose of n circles as shown in diagram. Put natural numb…

import java.util.Scanner;public class Main1016 { public static void main(String[] args) { Scanner cin=new Scanner(System.in); int k=1; while(cin.hasNext()){ int n=cin.nextInt(); int []a=new int [n]; int []color=new int [n]; for(int i=0;i<n;i++){ a[i]…

这个题就是给出一个数字n,表示有n个数.编号为1~n. 然后要求我们将这n个数连起来变成一个环,要求随意两个数相加所得值必须为素数. 假设满足条件就将这个环输出来! 这个题:dfs+回溯+推断.然后注意先是将值放到一条线上, 假设头尾相加和也为素数,则能够连成环,然后就能够输出了! 代码例如以下: #include<iostream> #include<cstring> #include<cstdio> using namespace std; int n,a[22];…

#include <stdio.h>#include <string.h> int prime[38]={0,0,1,1,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1};int visit[21]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};int result[21]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 55053    Accepted Submission(s): 24366 Problem Description A ring is compose of n circles as shown in diagram. Put natural numb…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 40339    Accepted Submission(s): 17813 Problem Description A ring is compose of n circles as shown in diagram. Put natural num…