#include<bits/stdc++.h>
#define N 2005
#define re register
#define ll long long
using namespace std;
int n,m,K,q;
inline void Rd(int &res){
    re char c;res=0;
    while(c=getchar(),c<48);
    do res=(res<<3)+(res<<1)+(c^48);
    while(c=getchar(),c>47);
}
int a[N],b[N];
ll f[N][N];
void Up(ll &x,ll y){((x==-1)||(x<y))&&(x=y);}
int main(){
    int T;
    Rd(T);
    while(T--){
        Rd(n);
        for(re int i=1;i<=n;i++)Rd(a[i]);
        for(re int i=1;i<=n;i++)Rd(b[i]);
        for(re int i=0;i<=n;i++)
            for(re int j=0;j<=n;j++)f[i][j]=-1;
        f[0][0]=0;
        for(re int i=0;i<n;i++){
            for(re int j=0;j<=i;j++)if(f[i][j]>=0){
                Up(f[i+1][j],f[i][j]+b[i+1]);
                if(f[i][j]+b[i+1]>=a[i+1])Up(f[i+1][j+1],f[i][j]+b[i+1]-a[i+1]);
            }
        }
        ll ans=0;
        for(re int i=1;i<=n;i++)if(f[n][i]>=0)ans=i;
        printf("%lld\n",ans);
    }
    return 0;
}