#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i = 0; i < n; i++)
#define rep2(i, x, n) for(int i = x; i <= n; i++)
#define rep3(i, x, n) for(int i = x; i >= n; i--)
#define each(e, v) for(auto &e: v)
#define pb push_back
#define eb emplace_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)x.size()
using ll = long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
const int MOD = 1000000007;
//const int MOD = 998244353;
const int inf = (1<<30)-1;
const ll INF = (1LL<<60)-1;
template<typename T> bool chmax(T &x, const T &y) {return (x < y)? (x = y, true) : false;};
template<typename T> bool chmin(T &x, const T &y) {return (x > y)? (x = y, true) : false;};

struct io_setup{
    io_setup(){
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        cout << fixed << setprecision(15);
    }
} io_setup;

struct Union_Find_Tree{
    vector<int> data;
    const int n;
    
    Union_Find_Tree(int n) : n(n){
        data.assign(n, -1);
    }
    
    int root(int x){
        if(data[x] < 0) return x;
        return data[x] = root(data[x]);
    }

    int operator [] (int i) {return root(i);}
    
    bool unite(int x, int y){
        x = root(x), y = root(y);
        if(x == y) return false;
        if(data[x] > data[y]) swap(x, y);
        data[x] += data[y], data[y] = x;
        return true;
    }
    
    int size(int x) {return -data[root(x)];}
    
    bool same(int x, int y) {return root(x) == root(y);}
    
    void clear() {fill(all(data), -1);}
};

int main(){
    int N; cin >> N;

    vector<int> A(N), B(N), P(N);
    rep(i, N) cin >> A[i];
    rep(i, N) cin >> B[i];
    rep(i, N) cin >> P[i];

    Union_Find_Tree uf(N);

    vector<double> C(N), E(N), F(N);
    rep(i, N){
        C[i] = A[i]-B[i];
        if(P[i] > 0) E[i] = 1.0/P[i];
        else E[i] = -1e9;
        if(E[i] < -1) F[i] = 0;
        else F[i] = C[i]*C[i]/E[i];
    }

    double ans = 0;
    rep(i, N) ans += F[i];

    int Q; cin >> Q;
    while(Q--){
        int u, v; cin >> u >> v; u--, v--;
        if(uf.same(u, v)){
            cout << ans << '\n';
            continue;
        }

        u = uf.root(u), v = uf.root(v);
        uf.unite(u, v);
        int w = uf.root(u);

        ans -= F[u], ans -= F[v];
        C[w] = C[u]+C[v], E[w] = E[u]+E[v];

        if(E[w] < -1) F[w] = 0;
        else F[w] = C[w]*C[w]/E[w];
        ans += F[w];
        cout << ans << '\n';
    }
}