字符串专题：H - Blue Jeans(暴力法)

/*大致题意：

就是求k个的字符串的最长连续公共子串，

规定：1、  最长公共串长度小于3不输出	2、  若出现等长的最长的子串，则输出字典序最小的串

解题思路：

纠结了几个月放着没做的题目。。一直以为要用KMP或者后缀数组来做。。。然后我就拼命学后缀。。。今天偶然发现直接 暴力 能够达到0ms的效果= =

所以。。。暴力吧。。。不愧为初级的题。。。

暴力思想很简单：(2<=k<=10 && len=60) 数据量很小

开二维DNA[][]保存所有DNA序列

1、  以DNA[0]为母版，顺次截取60个长度length=1的子串dna[]，检查其他DNA[i]是否都有子串dna，若是则把dna[]复制到obj[]，否则枚举下一个长

度length的子串；若obj与新的dna等长，则比较两者字典序，当dna字典序小时，复制到obj。

2、  第1步循环60次后length+1。顺次截取59个长度length=2的子串dna[]，重复1的操作更新obj。。

3、  第2步循环59次后length+1。顺次截取58个长度length=3的子串dna[]，继续。。

...........

60、第59步循环2次后length+1。顺次截取1个长度length=60的子串dna[]，继续重复操作更新obj。。

61、输出obj

*/

//Memory Time 
//248K   16MS 

#include<iostream>
#include<string.h>
using namespace std;

const int len=60;

int main(int i,int j)
{
	int test;
	cin>>test;
	for(int t=1;t<=test;t++)
	{
		int n;  //DNA个数
		cin>>n;
		char** DNA=new char* [n];//DNA是个指针数组，元素指向的对象是个字符串指针，
		//new char* 字符指针，大小为n。理解** DNA为二维数组的首地址更简单
		for(int p=0;p<n;p++)
		{
			DNA[p]=new char[len+1];//new char 字符，大小为n，即为长为n的字符串。
			cin>>DNA[p];
		}

		char obj[len+1];  //所有DNA的公共串
		int StrLen=0;    //最长公共串长度
		int length=1;    //当前枚举的公共串长度

		for(i=0;;i++)  //枚举公共串dna[]
		{
			/*截取DNA[0][]中以pi为起点，长度为length的子串dna[]*/
			char dna[len+1];
			int pi=i;
			if(pi+length>len)
			{
				length++;
				i=-1;
				if(length>len)
					break;
				continue;//continue后任会执行i++。
			}
			for(j=0;j<length;j++)
				dna[j]=DNA[0][pi++];
			dna[j]='\0';

			/*检查其他DNA[][]是否都存在字符串dna[]*/
			bool flag=true;
			for(int k=1;k<n;k++)
				if(!strstr(DNA[k],dna))  //存在一个DNA不含有dna[]
				{
					flag=false;
					break;
				}

			/*确认最大公共串*/
			if(flag)
			{
				if(StrLen<length)
				{
					StrLen=length;
					strcpy(obj,dna);	
				}
				else if(StrLen==length)
				{
					if(strcmp(obj,dna)>0)  //存在相同长度的公共串时，取最小字典序的串
						strcpy(obj,dna);
				}
			}
		}

		if(StrLen<3)
			cout<<"no significant commonalities"<<endl;
		else
			cout<<obj<<endl;

		delete DNA;
	}
	return 0;
}

/*
Sample Input
 
11
2
GATACCAGATACCAGATACCAGATACCAGATACCAGATACCAGATACCAGATACCAGATA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
3
GATACCAGATACCAGATACCAGATACCAGATACCAGATACCAGATACCAGATACCAGATA
GATACTAGATACTAGATACTAGATACTAAAGGAAAGGGAAAAGGGGAAAAAGGGGGAAAA
GATACCAGATACCAGATACCAGATACCAAAGGAAAGGGAAAAGGGGAAAAAGGGGGAAAA
3
CATCATCATCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
ACATCATCATAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AACATCATCATTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
2
GATGATGATGATGATGATGATGATGATGATGATGATGATGATGATGATGATGATGATGAT
GATTGATTGATTGATTGATTGATTGATTGATTGATTGATTGATTGATTGATTGATTGATT
10
GATGATGATGATGATGATGATGATGATGATGATGATGATGATGATGATGATGATGATGAT
GATTGATTGATTGATTGATTGATTGATTGATTGATTGATTGATTGATTGATTGATTGATT
GATTTGATTTGATTTGATTTGATTTGATTTGATTTGATTTGATTTGATTTGATTTGATTT
GATTTTGATTTTGATTTTGATTTTGATTTTGATTTTGATTTTGATTTTGATTTTGATTTT
AGATAGATAGATAGATAGATAGATAGATAGATAGATAGATAGATAGATAGATAGATAGAT
AAGATAAGATAAGATAAGATAAGATAAGATAAGATAAGATAAGATAAGATAAGATAAGAT
AAAGATAAAGATAAAGATAAAGATAAAGATAAAGATAAAGATAAAGATAAAGATAAAGAT
CGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGAT
CCGATCCGATCCGATCCGATCCGATCCGATCCGATCCGATCCGATCCGATCCGATCCGAT
CCCGATCCCGATCCCGATCCCGATCCCGATCCCGATCCCGATCCCGATCCCGATCCCGAT
10
GATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATC
GCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTA
TAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGC
CGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGATCGAT
GTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGTGT
GAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGAGA
GCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGCGC
ATATATATATATATATATATATATATATATATATATATATATATATATATATATATATAT
ACACACACACACACACACACACACACACACACACACACACACACACACACACACACACAC
TCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTCTC
10
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
10
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
GAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
GAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAG
GGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAG
GGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGG
GGGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGG
GGGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGGG
GGGGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGGG
GGGGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGGGG
GGGGGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGGGG
4
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
10
AAAAAATAAAAAATAAAAAATAAAAAATAAAAAATAAAAAATAAAAAATAAAAAATAAAA
AAAAACAAAAACAAAAACAAAAACAAAAACAAAAACAAAAACAAAAACAAAAACAAAAAC
AAAAAGAAAAAGAAAAAGAAAAAGAAAAAGAAAAAGAAAAAGAAAAAGAAAAAGAAAAAG
AAAAATAAAAATAAAAATAAAAATAAAAATAAAAATAAAAATAAAAATAAAAATAAAAAT
AAAACAAAACAAAACAAAACAAAACAAAACAAAACAAAACAAAACAAAACAAAACAAAAC
AAAAGAAAAGAAAAGAAAAGAAAAGAAAAGAAAAGAAAAGAAAAGAAAAGAAAAGAAAAG
AAAATAAAATAAAATAAAATAAAATAAAATAAAATAAAATAAAATAAAATAAAATAAAAT
AAACAAACAAACAAACAAACAAACAAACAAACAAACAAACAAACAAACAAACAAACAAAC
AAATAAATAAATAAATAAATAAATAAATAAATAAATAAATAAATAAATAAATAAATAAAT
AAAGAAAGAAAGAAAGAAAGAAAGAAAGAAAGAAAGAAAGAAAGAAAGAAAGAAAGAAAG
2
GATGATGCATCATGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGACTACTAA
GATGATCATCATACTACTCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

Sample Output

no significant commonalities
AGATAC
CATCATCAT
TGAT
GAT
no significant commonalities
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
no significant commonalities
AAA
ACTACT

*/