/*
i + j + min( sumb[rb[j]]-sumb[lb[i]] , suma[ra[j]]-suma[la[i]] )

1^ sumb[rb[j]]-sumb[lb[i]] <= suma[ra[j]]-suma[la[i]]

=>  suma[ra[j]] - sumb[rb[j]] >= suma[la[i]]-sumb[lb[i]]

2^ sumb[rb[j]]-sumb[lb[i]] >= suma[ra[j]]-suma[la[i]]

=> sumb[rb[j]] - suma[ra[j]] >= sumb[lb[i]]-suma[la[i]]
*/ 
#include<bits/stdc++.h>
using namespace std;
const int N=1e6+5;
int T,n,m,LIM;
int a[N],b[N];
int la[N],lb[N],ra[N],rb[N],suma[N],sumb[N];
int k1,k2,k3,k4;
struct BIT{
	int S[N*2];
	void clear(){
		for(int i=1;i<=LIM*2;i++) S[i]=-0x3f3f3f3f;
	}
	void update(int x,int v){
		for(x+=LIM;x<=LIM*2;x+=x&-x)
			S[x]=max(S[x],v);
	}
	int ask(int x){
		int ret=-0x3f3f3f3f;
		for(x+=LIM;x;x-=x&-x)
			ret=max(ret,S[x]);
		return ret;
	}
}T1,T2;
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin>>T;
	while(T--){
		k1=k2=k3=k4=0;
		int ans=0;
		cin>>n>>m;
		LIM=max(n,m);
		T1.clear();T2.clear();
		ra[0]=n+1,rb[0]=m+1;
		for(int i=1;i<=n+1;i++) la[i]=n+1,ra[i]=0;
		for(int i=1;i<=m+1;i++) lb[i]=m+1,rb[i]=0;
		for(int i=1;i<=n;i++){
			cin>>a[i];
			if(a[i]==1) la[++k1]=i;
			suma[i]=suma[i-1]+(a[i]==2);
		}
		for(int i=1;i<=m;i++){
			cin>>b[i];
			if(b[i]==1) lb[++k2]=i;
			sumb[i]=sumb[i-1]+(b[i]==2);
		}
		for(int i=n;i>=1;i--) if(a[i]==3) ra[++k3]=i;
		for(int i=m;i>=1;i--) if(b[i]==3) rb[++k4]=i;
		for(int i=0,j=min(n,m);j>=0;j--){
			for(;i<=n&&i<=m&&la[i]<ra[j]&&lb[i]<rb[j];i++){
				T1.update(suma[la[i]]-sumb[lb[i]],i-sumb[lb[i]]);
				T2.update(sumb[lb[i]]-suma[la[i]],i-suma[la[i]]);
			}
			ans=max(ans,max(j+sumb[rb[j]-1]+T1.ask(suma[ra[j]-1]-sumb[rb[j]-1]),
				j+suma[ra[j]-1]+T2.ask(sumb[rb[j]-1]-sumb[lb[i]-1])));
		}
		cout<<ans<<'\n';
	}
	return 0;
}