两个整数A和B。
问号有几种可能性？
A有几种可能性？
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其他操作
A46 B44
A42 B48
A2020 B2
A0 B2022
A-2 B-2020
A-2022 B0
A-44 B-46
A-48 B-42
2025，2009，6057，-2023
所以问号一共有4种可能性，A一共有8种可能性。
for a in range(-2021,2022):
for b in range(-2021,2022):
if (a+1)*(b-1) == 2021:
print(a)
output:
-48
-44
-2
42
46
2020