Java 代码

import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);

        int n = cin.nextInt();

        for (int i = 0; i < n; i ++)
        {
            String s = cin.next();

            int count = 0;
            char x = s.charAt(0);

            for (int j = 0; j < s.length(); j ++)
            {
                int k = j;
                while (k < s.length() && s.charAt(k) == s.charAt(j))
                    k ++;

                if (k - j > count)
                {
                    count = k - j;
                    x = s.charAt(j);
                }
                j = k - 1;
            }
            System.out.println (x + " " + count);
        }
    }
}