HDU 5475 La Vie en rose(暴力 2016 Multi-University Training Contest 2 )


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Problem Description

Professor Zhang would like to solve the multiple pattern matching problem, but he only has only one pattern string p=p1p2…pm. So, he wants to generate as many as possible pattern strings from p using the following method:

select some indices i1,i2,…,ik such that 1≤i1< i2<…< ik<|p| and |ij−ij+1|>1 for all 1≤j< k.
swap pij and pij+1 for all 1≤j≤k.
Now, for a given a string s=s1s2…sn, Professor Zhang wants to find all occurrences of all the generated patterns in s.

Input

There are multiple test cases. The first line of input contains an integer T, indicating the number of test cases. For each test case:

The first line contains two integers n and m (1≤n≤105,1≤m≤min{5000,n}) – the length of s and p.

The second line contains the string s and the third line contains the string p. Both the strings consist of only lowercase English letters.

Output

For each test case, output a binary string of length n. The i-th character is “1” if and only if the substring sisi+1…si+m−1 is one of the generated patterns.

Sample Input

3

4 1

abac

a

4 2

aaaa

aa

9 3

abcbacacb

abc

Sample Output

1010

1110

100100100

题目大意： 

模式匹配，可以交换一次相邻字符。

 

说句实话，这道题的标程是dp，有的人用暴力过了，这里我用的是kmp优化写的，速度3588MS

#include<stdio.h>
#include<string>
#include<cstring>
#include<iostream>
using namespace std;
int f[100000];
void get_next(string a)
{
int i=0;f[0]=-1;int j=-1;
while(i<a.length()-1)
{
if(j==-1||a.c_str()[i]==a.c_str()[j])
{
++i;
++j;
f[i]=j;
}
else
j=f[j];
}
}
int kmp(string a,string b,int pos)
{
int i=pos;int j=0;
int l1,l2;
l1=a.length();
l2=b.length();
while(i<l1&&j<l2)
{
bool fa=0;
if(j==-1||a.c_str()[i]==b.c_str()[j])
{
i++;j++;
}
else if(fa==0&&l1!=i&&l2!=j)
{
fa=1;
if(a.c_str()[i+1]==b.c_str()[j]&&a.c_str()[i]==b.c_str()[j+1])
{
i+=2;
j+=2;
}
else
return -1;
}
else j=f[j];
}
if(j>=b.length())return i-b.length();
return -1;
}
int main()
{
string a;
string b;
int t;
scanf("%d",&t);
while(t--)
{
int c,d;
scanf("%d %d",&c,&d);
cin>>a>>b;
get_next(a);
int temp=0;
for(int i=0;i<c;i++)
if(kmp(a,b,i)!=-1)
printf("1");
else printf("0");
printf("\n");
}
return 0;
}