http://acm.hdu.edu.cn/showproblem.php?pid=1560 仔细读题(!),则可发现这道题要求的是一个最短的字符串,该字符串的不连续子序列中包含题目所给的所有字符串 因为总共只有40个字符,可以尝试使用A*搜索 1.存储状态时直接存储40个字符,每个字符4种可能是肯定不行的. 因为要求的是包含不连续的子序列,所以只需记住当前字符串长度与每个子序列已经包含在当前字符串的长度, 比如题目中的输入样例 4 ACGT ATGC CGTT CAGT 可以这样存储一个序列…

HDU 1560 DNA sequence(DNA序列) Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)   Problem Description - 题目描述 The twenty-first century is a biology-technology developing century. We know that a gene is made of DNA. Th…

http://acm.hdu.edu.cn/showproblem.php?pid=1560 DNA sequence Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 732    Accepted Submission(s): 356 Problem Description The twenty-first century is a…

DNA sequence Time Limit : 15000/5000ms (Java/Other)   Memory Limit : 32768/32768K (Java/Other) Total Submission(s) : 15   Accepted Submission(s) : 7 Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description The twenty-first century…

题目地址:http://acm.hdu.edu.cn/showproblem.php?pid=1560 BFS题解:http://www.cnblogs.com/crazyapple/p/3218107.html 构造一个串,使得它包含所有的给定DNA序列,并且要求长度最短.采用dfs策略,对于每个串定义1个指针,当全部指针为串尾时判断构造的长度,由于状态空间过大,但是又存在冗余搜索,可以用迭代加深将状态减少.最长待构造长度 + 当前长度 < 迭代的最大深度则直接return,大大减少了状态数.…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1560 题目大意:给出n个字符串,让你找一个字符串使得这n个字符串都是它的子串,求最小长度. 解题思路:迭代加深搜索,迭代加深搜索,就是限制DFS的深度deep,若搜不到答案,则加深深度,重新搜索,这样就防止了随着深度不断加深而进行的盲目搜索.这题的迭代深度deep以这n个子串中的最长长度作为起点,不断+1,知道找到符合条件的字符串.每次DFS的时候,都要判断一下,当前的深度+最少还有加深的深度是否大…

The twenty-first century is a biology-technology developing century. We know that a gene is made of DNA. The nucleotide bases from which DNA is built are A(adenine), C(cytosine), G(guanine), and T(thymine). Finding the longest common subsequence betw…

给你最多8个长度不超过5的DNA系列,求一个包含所有系列的最短系列. 迭代加深的经典题.(虽然自己第一次写) 定一个长度搜下去,搜不出答案就加深大搜的限制,然后中间加一些玄学的减枝 //Twenty #include<cstdio> #include<cstdlib> #include<iostream> #include<algorithm> #include<cmath> #include<cstring> #include<…

题意:找到一个最短的串,使得所有给出的串是它的子序列,输出最短的串的长度,然后发现这个串最长是40 分析:从所给串的最长长度开始枚举,然后对于每个长度,暴力深搜,枚举当前位是哪一个字母,注意剪枝 注:然后我看网上都说这叫迭代加深搜索 #include <iostream> #include <cstdio> #include <vector> #include <cstring> #include <algorithm> #include <…

曾写过迭代加深搜索的方法,现在使用在AC自动上跑最短路的方法 dp[i][j]表示状态为到节点i,模式串是否包含的状态为j的最短串的长度,则状态转移方程为: dp[nx][ny] = min(dp[x][y] + 1) , 其中nx为x后继结点,ny为从y转移过来的新状态,更新时加入队列 #include<cstdio> #include<iostream> #include<cstdlib> #include<cstring> #include<al…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1560 DNA sequence Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2999    Accepted Submission(s): 1462 Problem Description The twenty-first centu…

DNA sequence Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4217    Accepted Submission(s): 2020 Problem Description The twenty-first century is a biology-technology developing century. We kno…

DNA sequence 直接中文了 题目描述 21世纪是生物科技飞速发展的时代.我们都知道基因是由DNA组成的,而DNA的基本组成单位是A,C,G,T.在现代生物分子计算中,如何找到DNA之间的最长公共子序列是一个基础性问题. 但是我们的问题不是那么简单:现在我们给定了数个DNA序列,请你构造出一个最短的DNA序列,使得所有我们给定的DNA序列都是它的子序列. 例如,给定"ACGT","ATGC","CGTT","CAGT"…

DNA Sequence Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9899   Accepted: 3717 Description It's well known that DNA Sequence is a sequence only contains A, C, T and G, and it's very useful to analyze a segment of DNA Sequence,For exa…

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HDU 1711 Number Sequence(数列) Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) [Description] [题目描述] Given two sequences of numbers : a[1], a[2], ...... , a[N], and b[1], b[2], ...... , b[M] (1 <= M <= 10000, 1 <= N…

HDU 1005 Number Sequence(数列) Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) [Description] [题目描述] A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. Given A, B, an…

DNA Sequence 题意:DNA的序列由ACTG四个字母组成,如今给定m个不可行的序列.问随机构成的长度为n的序列中.有多少种序列是可行的(仅仅要包括一个不可行序列便不可行).个数非常大.对100000取模. 思路:推荐一个博客,讲的很清楚. 这样的题目.n非常大,首先想到的就是用矩阵来优化.那么怎样构造转移方程呢:首先建立一棵Trie,然后依照AC自己主动机的方式构造fail指针,然后会发现.当一个状态分别加入ACTG之后,会得到还有一个状态. (详细解释见代码) 代码: /* ID:…

DNA Sequence Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 11860   Accepted: 4527 Description It's well known that DNA Sequence is a sequence only contains A, C, T and G, and it's very useful to analyze a segment of DNA Sequence,For ex…

DNA Sequence Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 11860   Accepted: 4527 Description It's well known that DNA Sequence is a sequence only contains A, C, T and G, and it's very useful to analyze a segment of DNA Sequence,For ex…

DNA Sequence   Description It's well known that DNA Sequence is a sequence only contains A, C, T and G, and it's very useful to analyze a segment of DNA Sequence,For example, if a animal's DNA sequence contains segment ATC then it may mean that the a…

HDU 5860 Death Sequence(递推) 题目链接http://acm.split.hdu.edu.cn/showproblem.php?pid=5860 Description You may heard of the Joseph Problem, the story comes from a Jewish historian living in 1st century. He and his 40 comrade soldiers were trapped in a cave…

HDU 1005 Number Sequence(数论) Problem Description: A number sequence is defined as follows:f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. Given A, B, and n, you are to calculate the value of f(n).   Input The input consists of multipl…

DNA Sequence Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 19991   Accepted: 7603 Description It's well known that DNA Sequence is a sequence only contains A, C, T and G, and it's very useful to analyze a segment of DNA Sequence,For ex…

DNA sequence Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3503    Accepted Submission(s): 1681 Problem Description The twenty-first century is a biology-technology developing century. We kn…

HDU 1711 Number Sequence (字符串匹配,KMP算法) Description Given two sequences of numbers : a1, a2, ...... , aN, and b1, b2, ...... , bM (1 <= M <= 10000, 1 <= N <= 1000000). Your task is to find a number K which make aK = b1, aK+1 = b2, ...... , aK+M…

DNA Sequence Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9889   Accepted: 3712 Description It's well known that DNA Sequence is a sequence only contains A, C, T and G, and it's very useful to analyze a segment of DNA Sequence,For exa…

题意:给你几个模式串,问你主串最少改几个字符能够使主串不包含模式串 思路:从昨天中午开始研究,研究到现在终于看懂了.既然是多模匹配,我们是要用到AC自动机的.我们把主串放到AC自动机上跑,并保证不出现模式串,这里对AC自动机的创建有所改动,我们需要修改不存在但是符合要求的节点,如果某节点的某一子节点不存在,我们就把这个子节点指向他父辈节点存在的该节点(比如k->next[1]不存在,k->fail->next[1]存在,我们就把他改为k->next[1] = k->fail-…

DNA sequence Time Limit : 15000/5000ms (Java/Other)   Memory Limit : 32768/32768K (Java/Other) Total Submission(s) : 15   Accepted Submission(s) : 7 Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description The twenty-first century…

题目链接:https://vjudge.net/problem/POJ-2778 DNA Sequence Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 18479   Accepted: 7112 Description It's well known that DNA Sequence is a sequence only contains A, C, T and G, and it's very useful to…