#include<bits/stdc++.h>
#define int long long
using namespace std;
int T,n,m,k,a[10000007],ans,t[10000007];
const int mod=998244353;
signed main(){
	cin>>T;
	t[0]=1;
	for(int i=1;i<=10;i++){
		t[i]=t[i-1]*i;
		//cout<<t[i]<<" ";
	}
	while(T--){
		ans=1;
		cin>>n>>m;
		k=1;
		for(int i=1;i<=n;i++){
			cin>>a[i];
			if(a[i]<=a[i-1])k++;
		}
		m=m-k;
		int w=n-k;
		int f=1;
		for(int i=m;i>=1;i--)f=f*(w-i+1);
		for(int i=m;i>=1;i--){
			ans=ans+f/i;
			f=f/(w-i+1);
			ans=ans%mod;
		}
		cout<<ans<<endl;
	}
	return 0;
}