#include<bits/stdc++.h>
using namespace std;
int t,a,b;
int minn,maxx;
int main(){
    cin>>t;
    while(t--){
        scanf("%d%d",&a,&b);
        if((a+b)&1){//奇数
            minn=max(a,b)-(a+b+1)/2;
            maxx=a+b-minn;
            printf("%d\n",maxx-minn+1);
            for(int i=minn;i<=maxx;i++){
                printf("%d ",i);
            }
        }
        else{
            minn=abs(a-(a+b)/2);
            maxx=a+b-minn;
            printf("%d\n",(maxx-minn)/2+1);
            for(int i=minn;i<=maxx;i+=2){
                printf("%d ",i);
            }
        }
        printf("\n");
    }
    return 0;
}

自己跟题解试找不到错误样例，挂在第二个点
另外在剪贴板里找到一份对拍代码，但不知道怎样开始运行

@echo off
:loop
Untitled1.exe
test1.exe
test2.exe
fc out1.txt out2.txt
if not errorlevel 1 goto loop
pause
:end