#define PROB Training
#include <cstdio>
#include <cstring>
#include <vector>
#include <utility>
typedef std::pair<int,int> PII;

#define f(x,y,z) for(int x = (y),__ = (z);x < __;++x)
#define g(x,y,z) for(int x = (y),__ = (z);x <= __;++x)
#define gd(x,y,z) for(int x = (y),__ = (z);x >= __;--x)
#define CLR(X) memset(X,0,sizeof(X))
#define SET(ARR,X) memset(ARR,X,sizeof(ARR))
#define R(X,Y) f(X,0,Y)
#define G(x,y) g(X,0,Y)
#define MAXN 1033

#ifdef WIN32
    #define LLD "%I64d"
    #define LLU "%I64u"
#else
    #define LLD "%lld"
    #define LLU "%llu"    
#endif

typedef long long LL;
typedef long double real;

int T;
int n;
int a[100033],s[100033];
bool vis[100033];
int ans,cnt,tee;
int main(){
    scanf("%d",&T);
    while (T--){
        scanf("%d",&n);
        memset(vis,0,sizeof vis);
        f(i,0,n)scanf("%d",a + i);
        f(i,0,n)scanf("%d",s + a[i]);
        ans = 0;
        f(i,0,n)if (a[i] == s[ a[i] ])++ans;
        else if (!vis[ a[i] ]){
            cnt = 0;tee = a[i];
            while (!vis[tee]){
                vis[tee] = 1;
                tee = s[tee];
                ++cnt;
            }
            ans += cnt - 1;
        }
        printf("%d\n",ans);
    }
    
    return 0;
}


//1 5 3 2 6 4
//3 6 2 4 5 1
//
//1 3 2 4 6 5
//3 2 4 1 5 6