#include <bits/stdc++.h> #define ll long long using namespace std; int main() { int t; cin>>t; int n, m; while(t--){ cin>>n>>m; if(n%m==0){ cout<<n-1<<'\n'; for(int i=1; i<n; i++){ cout<<1<<" "; } }else if(m%n==0){ cout<<m-1<<'\n'; for(int i=1; i<m; i++){ cout<<-1<<" "; } }else if(m==2){ cout<<n<<'\n'; for(int i=0; i<n; i++){ if(i%2==0){ cout<<-n<<" "; }else{ cout<<n+1<<" "; } } }else if(n==2){ cout<<m<<'\n'; for(int i=0; i<m; i++){ if(i%2==0){ cout<<m<<" "; }else{ cout<<-m-1<<" "; } } } cout<<'\n'; } }