python 读取list

# x= input()
# y =x+2
# print(y)

# B = input()
# Blist = B.split(",")
# Blist = [int(Blist[i]) for i in range(len(Blist))]
# print(Blist[0])

# n =6
# for i in range(1,n):
#     print(i)




n,a1 =3 ,1
Blist = [-9 ,-81 , 90]
a2 = a1- Blist[0]     # Blist[0]=B1

A= Blist
A[0]=  a1
A[1] = a2
for i in range(1,n-1):
    Bindex = i -1
    Ai = A[i]
    Aid1 = A[i-1]
    Aia1 = 2*Ai - Aid1 - Blist[Bindex]
    A.append(Aia1)

A[-1] = Blist[-1] +A[-2]
A.pop()
print(" ".join(str(i) for i in A))