/* 值域 1-3，求最长公共上升子序列 

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]]

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

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

=> suma[ra[j]] - sumb[rb[j]] <= suma[la[i]]-sumb[lb[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(){
		memset(S,0,sizeof S);
	}
	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=0;
		for(x+=LIM;x;x-=x&-x)
			ret=max(ret,S[x]);
		return ret;
	}
}T1,T2;
int main(){
	ra[0]=rb[0]=0x3f3f3f3f;
	scanf("%d",&T);
	while(T--){
		k1=k2=k3=k4=0;
		int ans=0;
		scanf("%d%d",&n,&m);
		LIM=min(n,m);
		T1.clear();T2.clear();
		for(int i=1;i<=n;i++) scanf("%d",&a[i]);
		for(int i=1;i<=m;i++) scanf("%d",&b[i]);
		for(int i=1;i<=n;i++) if(a[i]==1) la[++k1]=i;
		for(int i=1;i<=m;i++) if(b[i]==1) lb[++k2]=i;
		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=1;i<=n;i++) suma[i]=suma[i-1]+(a[i]==2);
		for(int i=1;i<=m;i++) sumb[i]=sumb[i-1]+(b[i]==2);
		for(int i=0,j=min(k3,k4);j>=0;j--){
			for(;i<=k1&&i<=k2&&la[i]<ra[j]&&lb[i]<rb[j];i++){
				if(i==0) continue;
				T1.update(sumb[rb[i]]-suma[ra[i]],i+sumb[rb[i]]);
				T2.update(suma[ra[i]]-sumb[rb[i]],i+suma[ra[i]]);
			}
			ans=max(ans,max(j-sumb[lb[j]]+T1.ask(sumb[lb[j]]-suma[la[j]]),j-suma[la[j]]+T2.ask(suma[la[j]]-sumb[lb[j]])));
		}
		printf("%d\n",ans);
	}
	return 0;
}