题解 | #最长回文子串#

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner input = new Scanner(System.in);
        while(input.hasNext()){
            String s = input.nextLine();
            System.out.println(totalLength(s));
        }
    }
    public static int totalLength(String s){
        int count = 0;
        int left = 0;
        int right = s.length()-1;
        while(left<right){
            char leftChar = s.charAt(left);
            char rightChar = s.charAt(right);
            if(leftChar == rightChar){
                count++;
            }
            else{
                count = 0;
            }
            left++;
            right--;
        }
        return count*2;
    }
}