palindrome.java

//Palindrome index

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

class Result {

    /*
     * Complete the 'palindromeIndex' function below.
     *
     * The function is expected to return an INTEGER.
     * The function accepts STRING s as parameter.
     */

    public static int palindromeIndex(String s) {
    // Write your code here
        int left=0;
        int right=s.length()-1;
        while(left<right){
            if(s.charAt(left)!=s.charAt(right)){
                if(isPalindrome(s,left+1,right)){
                    return left;
                }
                if(isPalindrome(s,left,right-1)){
                    return right;
                }
                return -1;
            }
            left++;
            right--;
        }
        return -1;

    }
    private static boolean isPalindrome(String s,int start,int end){
        while(start<end){
            if(s.charAt(start)!=s.charAt(end)){
                return false;
            }
            start++;
            end--;
        }
        return true;
    }

}

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int q = Integer.parseInt(bufferedReader.readLine().trim());

        IntStream.range(0, q).forEach(qItr -> {
            try {
                String s = bufferedReader.readLine();

                int result = Result.palindromeIndex(s);

                bufferedWriter.write(String.valueOf(result));
                bufferedWriter.newLine();
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        });

        bufferedReader.close();
        bufferedWriter.close();
    }
}