题解 | 牛牛的考试

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        while(n-->0){
            Choice[] choice = new Choice[4];
            char[] select = {'A','B','C','D'};
            for(int i=0;i<4;i++){
                String s = in.next();
                int len = s.length();
                choice[i] = new Choice();
                choice[i].s = select[i];
                choice[i].n = len;
            }
            Arrays.sort(choice,Comparator.comparingInt(Choice::get_n));
            if(choice[0].n==choice[1].n&&choice[2].n<choice[3].n){
                System.out.println(choice[3].s);//三短一长
            }else if(choice[2].n==choice[3].n&&choice[0].n<choice[1].n){
                System.out.println(choice[0].s);//三长一短
            }else System.out.println('C');
        }
    }
}
class Choice{
    public char s;
    public int n;
    Choice(){
        this.n = 0;
    }
    public int get_n(){
        return this.n;
    }
}