杭电OJ 1002 A + B Problem II求助

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner scanner=new Scanner(System.in);
        while(scanner.hasNext()) {
            int a = scanner.nextInt();
            if (a <= 20 && a >= 1){
                int[] sumb=new int[a*2];
                for(int i=0;i< sumb.length;i++){
                    sumb[i]=scanner.nextInt();
                }
                for(int sum=0,i=1,s=1;i<= sumb.length;i++){
                    while(i<20){
                        System.out.println("case: "+s);
                            System.out.println(sum=sumb[i-1]+sumb[i]);
                            i++;
                            s++;
                            break;
                    }
                }return;

            }
        }
    }
}

我是新手 ...我自己测试能过 但是上去就是wrong answer
我觉得我这段代码有点投机倒把 可以各位大佬提一下建议吗

https://blog.csdn.net/huangzhuojie/article/details/45273933