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除10简化，将数据量缩小。
AC代码：
1 import java.util.Scanner; 2 3 public class Main { 4 5 public static void main(String[] args) { 6 7 Scanner sc=new Scanner(System.in); 8 int times=sc.nextInt(); 9 while(times-->0){ 10 System.out.println(solve(sc.nextInt())); 11 } 12 13 } 14 15 public static char solve(int score){ 16 switch(score/10){ 17 case 9: 18 case 10: 19 return 'A'; 20 case 8: return 'B'; 21 case 7: return 'C'; 22 case 6: return 'D'; 23 default: return 'E'; 24 } 25 } 26 27 }