帮助找到最长的对称子字符串 [英] Help on finding the longest symmetric sub-string
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问题描述
请在此程序上需要帮助.
我没有得到正确的结果...(程序应该找到最长的对称子字符串并显示它)
感谢您的帮助.
Please I need help with this program.
I am not getting proper result...(The program should find the longest symmetric sub-string and display it)
Thanks for the help.
#include <iostream>
#include<string>
using namespace std;
char s[30];
int i=0, j, first, last, length,subleng, maxi=0;
void main ()
{
cout<<"Enter a string to process \n";
cin>>s[i];
while (s[i]!='\0')
{
cin>>s[i];
i++;
}
length = static_cast<int>(strlen(s));
for(i=0 ; i<length ; i++)
{
for(j=length; j>=0; j--)
{
if (s[i]==s[j])
{
subleng= j-i;
if(subleng>maxi)
{
first=i;
last=j;
maxi= subleng;
}
}
}
}
cout<<"The longest symmetric substring is : \n";
for (i=first ; i<last ; i++)
{
cout<<s[i];
}
cout<<endl<<endl;
}
推荐答案
尝试以下代码:
Try the following code:
#include <iostream>
#include<string>
using namespace std;
char s[30];
int i=0, j, first, last, length,subleng, maxi=0;
void main ()
{
cout<<"Enter a string to process \n";
cin >> s;
length = static_cast<int>(strlen(s));
for(i=0 ; i<length ; i++)
{
int j,k,n;
for (n=0; n<2; n++)
{// 0 => even symmetric substrings, 1 => odd symmetric substrings
j = i-n;
k = i+1;
subleng = n;
while ( j>=0 && k<length && s[j]==s[k])
{
subleng +=2;
j--; k++;
}
if( subleng > maxi)
{
first= j + 1;
maxi= subleng;
}
}
}
cout<<"The longest symmetric substring is : \n";
for (i=0 ; i<maxi ; i++)
{
cout<<s[first+i];
}
cout<<endl<<endl;
}
:)
在内部for
循环中,您应该将if (s[i]==s[j])
更改为if (s[i]==s[j-1])
...
Inside the innerfor
loop you should changeif (s[i]==s[j])
toif (s[i]==s[j-1])
...
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