#include<bits/stdc++.h>
using namespace std;
//#include <atcoder/lazysegtree>
//using namespace atcoder;
//using mint = modint998244353;
//using mint = modint1000000007;
#pragma region template
using ll = long long;
using PII = pair<int, int>;
using PLL = pair<ll, ll>;
template <class T> using V = vector<T>;
template <class T> using VV = V<V<T>>;
#define overload4(_1,_2,_3,_4,name,...) name
#define overload3(_1,_2,_3,name,...) name
#define rep1(n) for(ll i=0;i<n;++i)
#define rep2(i,n) for(ll i=0;i<n;++i)
#define rep3(i,a,b) for(ll i=a;i<b;++i)
#define rep4(i,a,b,c) for(ll i=a;i<b;i+=c)
#define rep(...) overload4(__VA_ARGS__,rep4,rep3,rep2,rep1)(__VA_ARGS__)
#define rrep1(n) for(ll i=n;i--;)
#define rrep2(i,n) for(ll i=n;i--;)
#define rrep3(i,a,b) for(ll i=b;i-->(a);)
#define rrep(...) overload3(__VA_ARGS__,rrep3,rrep2,rrep1)(__VA_ARGS__)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) ((int)(x).size())
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define debug(var)  do{std::cerr << #var << " : ";view(var);}while(0)
template<typename T> void view(T e){std::cerr << e << std::endl;}
template<typename T> void view(const std::vector<T>& v){for(const auto& e : v){ std::cerr << e << " "; } std::cerr << std::endl;}
template<typename T> void view(const std::vector<std::vector<T> >& vv){cerr << endl;int cnt = 0;for(const auto& v : vv){cerr << cnt << "th : "; view(v); cnt++;} cerr << endl;}
std::ostream &operator<<(std::ostream &dest, __int128_t value) {
  std::ostream::sentry s(dest);
  if (s) {
    __uint128_t tmp = value < 0 ? -value : value;
    char buffer[128];
    char *d = std::end(buffer);
    do {
      --d;
      *d = "0123456789"[tmp % 10];
      tmp /= 10;
    } while (tmp != 0);
    if (value < 0) {
      --d;
      *d = '-';
    }
    int len = std::end(buffer) - d;
    if (dest.rdbuf()->sputn(d, len) != len) {
      dest.setstate(std::ios_base::badbit);
    }
  }
  return dest;
}
template<class T, class K>bool chmax(T &a, const K b) { if (a<b) { a=b; return 1; } return 0; }
template<class T, class K>bool chmin(T &a, const K b) { if (b<a) { a=b; return 1; } return 0; }
const int inf = 1001001001;
const ll INF = 1001001001001001001ll;
int dx[]={1,0,-1,0};
int dy[]={0,1,0,-1};
ll rddiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // -20 / 3 == -7
ll power(ll a, ll p){ll ret = 1; while(p){if(p & 1){ret = ret * a;} a = a * a; p >>= 1;} return ret;}
ll modpow(ll a, ll p, ll mod){ll ret = 1; while(p){if(p & 1){ret = ret * a % mod;} a = a * a % mod; p >>= 1;} return ret;}
ll rudiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } //  20 / 3 == 7
#pragma endregion
// const double pi = acos(-1);
const ll mod = 998244353;
//const ll mod = 1000000007;

const int MAX = 500000;

long long fact[MAX], finv[MAX], inv[MAX];

void Comb_init(){
    fact[0] = fact[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for(int i = 2; i < MAX; i++){
        fact[i] = fact[i-1] * i % mod;
        inv[i] = mod - inv[mod % i] * (mod / i) % mod;
        finv[i] = finv[i - 1] * inv[i] % mod; 
    }
}

long long comb(long long n, long long k){
    if(n < k) return 0;
    if(n < 0 || k < 0) return 0;
    return fact[n] * finv[k] % mod * finv[n - k] % mod;
}
/**
 * don't forget pre-calculation 
 * in main fuction !!!
 **/

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    //cout << fixed << setprecision(20);
    Comb_init();
    int n, k; cin >> n >> k;
    V<int> a(n);
    V<int> p(n + 1);
    rep(i,n){
        cin >> a[i];
        p[a[i]] = i + 1;
    }
    int cnt = 1;
    rep(i,n - 1){
        int l = p[a[i] + 1];
        int r = p[a[i + 1] + 1];
        if(l > r) cnt++;
    }
    if(cnt > k){
        cout << 0 << endl;
        return 0;
    }
    cout << comb(n + k - cnt, k - cnt) << endl;
}