Find the max ;length palindrome in an input string.

Question

Sigiloso · Accepted Answer

A stupid and slow solution (O(n^3)):

        public static string MaxPalindrom(string str)
        {
            string maxP = String.Empty;

            for (int i = 0; i  maxP.Length)
                    {
                        maxP = str.Substring(i, j - i);
                    }
                }
            }

            return maxP;
        }

        private static bool isP(string str)
        {
            for (int i = 0, j = str.Length - 1; i < j; i++, j--)
            {
                if (str[i] != str[j])
                {
                    return false;
                }
            }

            return true;
        }

NotThatBad · Answer

Here's a code with O(n2) complexity

#include
#include
#include

void ispal(char*,int,int*);

void longpal(char *str)
{
   int longest[2]={0};
   int i=0;

   for(;i=0&&j(longest[1]-longest[0]))
	{
	   longest[0]=i;
	   longest[1]=j;
	}
     }
     i--;
     j++;
  }
}


void main()
{
   char *str;
   scanf("%s",str);
   longpal(str);
   getch();
}

NotThatBad · Answer

My answer is based on http://stevekrenzel.com/articles/longest-palnidrome

translated to c language.

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