题解 | 穷哈哈~

import java.util.Scanner;

public class Main{
    static Scanner in = new Scanner(System.in);
    public static void main(String[] args){
        int n = in.nextInt();
        String s = in.nextLine();
        s = in.nextLine();
        int ans = 0;
        int i = 0;
        while(i < n){
            if(s.charAt(i) != 'a' && s.charAt(i) != 'h'){
                i ++;
                continue;
            }
            if(s.charAt(i) == 'a'){
                int I = 1;
                int now = 0;
                while(i < n){
                    if(I == 1 && s.charAt(i) != 'a') break;
                    if(I == 0 && s.charAt(i) != 'h') break;
                    now ++;
                    i ++;
                    I ^= 1;
                }
                ans = Math.max(ans, now);
            }
            else if(s.charAt(i) == 'h'){
                int I = 0;
                int now = 0;
                while(i < n){
                    if(I == 1 && s.charAt(i) != 'a') break;
                    if(I == 0 && s.charAt(i) != 'h') break;
                    now ++;
                    i ++;
                    I ^= 1;
                }
                ans = Math.max(ans, now);
            }
        }
        System.out.print(ans);
    }
}