Code Visits Coderland Solutions

# Write your code here
N=int(input())
for i in range(N):
    n=int(input())
    c = list(map(int, input().split()))
    d = list(map(int, input().split()))
    s=0
    e=n
    m=min(c)
    while m<c[0]:
        k=c.index(m)
        s=s+m*sum(d[k:e])
        m=min(c[0:k])
        e=k
    s=s+m*sum(d[:e])
    print(s)
    
    '''
    input:
    1
    2
    5 1
    1 2
    output: 7   '''