这两个分治结果对得上吗

运行下面这段程序：

def dsum(a):
    if len(a) == 0:
        return 0
    if len(a) == 1:
        return a[0]
    m = len(a) // 2
    return dsum(a[:m]) + dsum(a[m:])

def dmax(a):
    if len(a) == 1:
        return a[0]
    m = len(a) // 2
    left = dmax(a[:m])
    right = dmax(a[m:])
    return left if left > right else right

A = [17, 24, 15, 13, 23]
print(dsum(A) == sum(A) and dmax(A) == max(A))