import sys

input = sys.stdin.readline

N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
P = list(map(int,input().split()))

S = [A[i]-B[i] for i in range(N)]
for i in range(N):
    if P[i]:
        P[i] = 1/P[i]
    else:
        P[i] = float("inf")

ans = 0
for i in range(N):
    ans += S[i]**2 / P[i]

parent = [i for i in range(N)]
g = [set([i]) for i in range(N)]

def unite(x,y):
    global ans
    if parent[x]==parent[y]:
        return

    gx,gy = parent[x],parent[y]
    if len(g[gy]) > len(g[gx]):
        gx,gy = gy,gx

    ans -= S[gx]**2 / P[gx]
    ans -= S[gy]**2 / P[gy]

    S[gx] += S[gy]
    P[gx] += P[gy]

    ans += S[gx]**2 / P[gx]

    for v in g[gy]:
        parent[v] = gx
        g[gx].add(v)

    g[gy] = []


res = []
for _ in range(int(input())):
    x,y = map(int,input().split())
    unite(x-1,y-1)
    res.append(ans)

print(*res,sep="\n")