#include using namespace std; typedef signed long long ll; #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define FORR2(x,y,arr) for(auto& [x,y]:arr) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) template bool chmax(T &a, const T &b) { if(a bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;} //------------------------------------------------------- int T; int N; int A[5050],B[5050]; int S[5050]; void solve() { int i,j,k,l,r,x,y; string s; cin>>T; while(T--) { cin>>N; FOR(i,N) { cin>>A[i]; A[i]--; S[i]=-1; } FOR(i,N) { cin>>B[i]; B[i]--; } FOR(i,N) { int flag=0; x=i; vector L,R; FOR(j,N+5) { L.push_back(x); x=A[x]; if(x==B[i]) flag|=2; if(x==i) { flag|=1; break; } } if((flag&2)==0) break; if((flag&1)==0) continue; x=i; FOR(j,N+5) { R.push_back(x); x=B[x]; if(x==i) break; } if(j==N+5) continue; int la=N+1,ra=N+1; FORR(a,L) la=min(la,a); FORR(a,R) ra=min(ra,a); if(S[la]==-1) S[la]=ra; if(S[la]!=ra) break; x=0; FORR(a,L) if(x