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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	String longestPalindrome(String str) {
  11.  
  12.     if (str.length() <= 1)
  13.       return str;
  14.  
  15.     String LPS = "";
  16.  
  17.     for (int i = 1; i < str.length(); i++) {
  18.  
  19.       // Consider odd length
  20.       int low = i;
  21.       int high = i;
  22.       while(str.charAt(low) == str.charAt(high)) {
  23.         low--;
  24.         high++;
  25.  
  26.         if (low == -1 || high == str.length())
  27.           break;
  28.       }
  29.  
  30.       String palindrome = str.substring(low+1, high);
  31.       if (palindrome.length() > LPS.length()) {
  32.         LPS = palindrome;
  33.       }
  34.  
  35.       // Consider even length
  36.       low = i-1;
  37.       high = i;
  38.       while(str.charAt(low) == str.charAt(high)) {
  39.         low--;
  40.         high++;
  41.  
  42.         if (low == -1 || high == str.length())
  43.           break;
  44.       }
  45.  
  46.       palindrome = str.substring(low+1, high);
  47.       if (palindrome.length() > LPS.length()) {
  48.         LPS = palindrome;
  49.       }
  50.     }
  51.  
  52.     return LPS;
  53.   }
  54.  
  55. 	public static void main (String[] args) throws java.lang.Exception
  56. 	{
  57. 		// your code goes here
  58. 		Ideone x = new Ideone();
  59. 		System.out.println(x.longestPalindrome("aaebabad"));
  60. 		System.out.println(x.longestPalindrome("cbeereed"));
  61. 	}
  62. }
Success #stdin #stdout 0.06s 32432KB
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Standard input is empty
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bab
eeree
https://ideone.com/GvH6g0
language:
Java (12.0.1)
created:
3 years ago
visibility:
public

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