#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cassert>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

struct UnionFind {
    vector<int> data;
    UnionFind(int size) : data(size, -1) {}
    bool unionSet(int x, int y) {
        x = root(x); y = root(y);
        if (x != y) {
        if (data[y] < data[x]) swap(x, y);
        data[x] += data[y]; data[y] = x;
        }
        return x != y;
    }
    bool findSet(int x, int y) {
        return root(x) == root(y);
    }
    int root(int x) {
        return data[x] < 0 ? x : data[x] = root(data[x]);
    }
    int size(int x) {
        return -data[root(x)];
    }
};

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(12) << fixed;
    int n; cin >> n;
    vector<int> a(n), b(n), p(n);
    for(int i = 0; i < n; i++) cin >> a[i];
    for(int i = 0; i < n; i++) cin >> b[i];
    for(int i = 0; i < n; i++) cin >> p[i];
    UnionFind uf(n);
    vector<long double> sum_ratio(n), sum_val(n);
    vector<ll> sum_ene(n);
    long double ans = 0.0;
    const long double inf = 1e9;
    for(int i = 0; i < n; i++){
        sum_ratio[i] = p[i] == 0 ? inf : (long double)1.0/(long double)p[i];
        // sum_ratio[i] =  (long double)1.0/(long double)p[i];
        sum_ene[i] = (a[i]-b[i]);
        sum_val[i] = p[i] == 0 ? 0 : p[i]*(a[i]-b[i])*(a[i]-b[i]);
        ans += sum_val[i];
    }
    int q; cin >> q;
    for(int i = 0; i < q; i++){
        int x, y; cin >> x >> y; x--; y--;
        if(!uf.findSet(x, y)){
            int xr = uf.root(x), yr = uf.root(y);
            long double sr = sum_ratio[xr]+sum_ratio[yr];
            int se = sum_ene[xr]+sum_ene[yr];
            long double sv = (long double)(se*se)/sr;
            if(2*sr > inf) {
                sv = 0.0;
            }
            ans += sv-sum_val[xr]-sum_val[yr];
            uf.unionSet(x, y);
            int r = uf.root(x);
            sum_ene[r] = se;
            sum_val[r] = sv;
            sum_ratio[r] = sr;
            // if(2*sr > inf && uf.size(r) == n) ans = 0.0;
            // cout << se << ' ' << sr << ' ' << sv << endl;
        }
        cout << ans << endl;
    }
}