#include <bits/stdc++.h>
using namespace std;
inline int read()
{
	char ch;
	while((ch=getchar())<'0'||ch>'9');
	int res=ch-'0';
	while((ch=getchar())>='0'&&ch<='9') res=res*10+ch-'0';
	return res;
}
const int N=1000100;
const int mod=998244353;
int n,a[N],jc[N],ny[N];
int ksm(int x,int K)
{
	int res=1;
	while(K)
	{
		if(K&1) res=1ll*res*x%mod;
		K>>=1;
		x=1ll*x*x%mod;
	}
	return res;
}
int C(int n,int m)
{
	return 1ll*jc[n]*ny[n-m]%mod*ny[m]%mod;
}
int mn[N],b[N];
int main()
{
	n=read();int K=read();
	jc[0]=1;
	for(int i=1;i<=n;i++) a[i]=read(),jc[i]=1ll*jc[i-1]*i%mod;
	ny[n]=ksm(jc[n],mod-2);
	for(int i=n-1;i>=0;i--) ny[i]=1ll*ny[i+1]*(i+1)%mod;
	mn[n+1]=n+1;
	for(int i=n;i>=1;i--) mn[i]=min(mn[i+1],a[i]);
	int top=0,ans=0;
	for(int i=1;i<=n;i++)
	{
		while(top&&a[i]<b[top]) top--;
		b[++top]=a[i];
		if(top>=K&&a[i]<mn[i+1]) (ans+=C(top-1,K-1))%=mod;
	}
	if(K&1) printf("%d",(mod-ans)%mod);
	else printf("%d",ans);
	return 0;
}