#include<iostream>
#include<cstdio>
using namespace std;
const int N=1000005;
int n;
int a[N],b[N],c[N];
void solve()
{
  cin>>n;
  for(int i=1;i<=n;i++)
    cin>>a[i];
  for(int i=1;i<=n;i++)
    cin>>b[i];
  for(int i=1;i<=n;i++)
    c[i]=b[i]-a[i];
  for(int i=1;i<=n;i++)
    if(c[i]<0)
    {
      cout<<"NO\n";
      return;
    }
  if(c[1]==0)
  {
    cout<<"NO\n";
    return;
  }
  if(n==2)
  {
    if(c[2]==0) cout<<"YES\n";
    else cout<<"NO\n";
    return;
  }
  int cnt=0;
  for(int i=1;i<=n;i++)
    cnt+=c[i];
  if(cnt>=n-1) cout<<"YES\n";
  else cout<<"NO\n";
  return;
}
int main()
{
  ios::sync_with_stdio(false);
  cin.tie(nullptr),cout.tie(nullptr);
  int T;
  cin>>T;
  while(T--)
    solve();
  return 0;
}