题目描述
Problem Statement
The AtCoder language has L different characters.
How many N-character strings s consisting of characters in the AtCoder language satisfy the following condition?
Find the count modulo 998244353.
- All K-character subsequences of the string s are different. More precisely, there are $_N\mathrm{C}_K$ ways to obtain a K-character string by extracting K characters from the string s and concatenating them without changing the order, and all of these ways must generate different strings.
What is $_N\mathrm{C}_K$?$_N\mathrm{C}_K$ refers to the total number of ways to choose K from $N items. More precisely, _N\mathrm{C}_K$ is the value of N! divided by K! $\times (N-K)$!.
Input
The input is given from Standard Input in the following format:
N K L
Output
Print the count modulo 998244353.
Constraints
- $1 \leq K < N \leq 500000$
- $1 \leq L \leq 10^9$
- All input values are integers.
Sample Input 1
4 3 2
Sample Output 1
2
If a and b represent the first and second characters in the language, the condition is satisfied by two strings: abab and baba.
Sample Input 2
100 80 26
Sample Output 2
496798269
Approximately 10^{86} strings satisfy the condition, but here we print the count modulo 998244353, which is 496798269.
Sample Input 3
100 1 26
Sample Output 3
0
Sample Input 4
500000 172172 503746693
Sample Output 4
869120
输入格式
见题面 Input 部分
输出格式
见题面 Output 部分