Training 3: FFT and Polynomial

Problem A

Unsolved.

Problem B

Unsolved.

Problem C

Unsolved.

Problem D

Unsolved.

Problem E

Unsolved.

Problem F

Solved by Xiejiadong.

超大数 $a\times b$ 。

看作多项式乘法，FFT模版题。

注意 $0\times a$ 的情况。

Problem G

Unsolved.

Problem H

Unsolved.