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  1. import java.util.Scanner;
  2.  
  3. // By nikoo28
  4. class PalindromeIndex {
  5.  
  6.   static boolean isPalindrome(String str) {
  7.  
  8.     int n = str.length();
  9.     for (int i = 0; i < n / 2; i++)
  10.       if (str.charAt(i) != str.charAt(n - i - 1)) return false;
  11.     return true;
  12.   }
  13.  
  14.   static int palindromeIndex(String s) {
  15.  
  16.     int start = 0;
  17.     int end = s.length() - 1;
  18.  
  19.     if (isPalindrome(s))
  20.       return -1;
  21.  
  22.     while (true) {
  23.  
  24.       if (start > end)
  25.         break;
  26.  
  27. 	// Code obtained from studyalgorithms.com
  28. 	// Feel free to copy but please acknowledge wherever possible.
  29.       if (s.charAt(start) == s.charAt(end)) {
  30.         start++;
  31.         end--;
  32.         continue;
  33.       }
  34.  
  35.       // Create string after removing start
  36.       if (isPalindrome(s.substring(0, start) + s.substring(start + 1))) {
  37.         return start;
  38.       } else if (isPalindrome(s.substring(0, end) + s.substring(end + 1))) {
  39.         return end;
  40.       } else
  41.         return -1;
  42.     }
  43.  
  44.     return -1;
  45.   }
  46.  
  47.   public static void main(String[] args) {
  48.     Scanner in = new Scanner(System.in);
  49.     int q = in.nextInt();
  50.     for (int a0 = 0; a0 < q; a0++) {
  51.       String s = in.next();
  52.       int result = palindromeIndex(s);
  53.       System.out.println(result);
  54.     }
  55.   }
  56. }
  57.  
Success #stdin #stdout 0.06s 4386816KB
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https://ideone.com/KAx8aC
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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