Problem:
Score : 500 points

Problem Statement

There are N blocks arranged in a row. Let us paint these blocks.

We will consider two ways to paint the blocks different if and only if there is a block painted in different colors in those two ways.

Find the number of ways to paint the blocks under the following conditions:

For each block, use one of the M colors, Color 1 through Color M, to paint it. It is not mandatory to use all the colors.

There may be at most K pairs of adjacent blocks that are painted in the same color.

Since the count may be enormous, print it modulo 998244353.

Constraints

All values in input are integers.

1 \leq N, M \leq 2 \times 10^5

0 \leq K \leq N - 1

Input

Input is given from Standard Input in the following format:

N M K

Output

Print the answer.

Sample Input 1

3 2 1

Sample Output 1

6

The following ways to paint the blocks satisfy the conditions: 112, 121, 122, 211, 212, and 221. Here, digits represent the colors of the blocks.

Sample Input 2

100 100 0

Sample Output 2

73074801

Sample Input 3

60522 114575 7559

Sample Output 3

479519525

Solution in Ruby (2.7.1) (judge verdict: Time Limit Exceeded)

N,M,K = gets.split.map(&:to_i)
Mod = 998244353
Com = lambda{|n,r| r = [n-r,r].min
	n.downto(n-r+1).inject(1){|a,x| a*x%Mod } *
	r.downto(1).inject(1){|a,x| a*x%Mod }.pow(Mod-2,Mod) % Mod
}
p (0..K).inject(0){|a,k|
	(a + Com[N-1,k] * M * (M-1).pow(N-1-k,Mod)) % Mod
}