#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll modinv(ll a, ll m) {
  assert(m > 0);
  if (m == 1) return 0;
  a %= m;
  if (a < 0) a += m;
  assert(a != 0);
  if (a == 1) return 1;
  return m - modinv(m, a) * m / a;
}
template <int MOD_>
struct modnum {
 private:
  int v;

 public:
  static const int MOD = MOD_;
  modnum() : v(0) {}
  modnum(ll v_) : v(int(v_ % MOD)) {
    if (v < 0) v += MOD;
  }
  explicit operator int() const { return v; }
  friend bool operator==(const modnum& a, const modnum& b) {
    return a.v == b.v;
  }
  friend bool operator!=(const modnum& a, const modnum& b) {
    return a.v != b.v;
  }
  modnum operator~() const {
    modnum res;
    res.v = modinv(v, MOD);
    return res;
  }
  modnum& operator+=(const modnum& o) {
    v += o.v;
    if (v >= MOD) v -= MOD;
    return *this;
  }
  modnum& operator-=(const modnum& o) {
    v -= o.v;
    if (v < 0) v += MOD;
    return *this;
  }
  modnum& operator*=(const modnum& o) {
    v = int(ll(v) * ll(o.v) % MOD);
    return *this;
  }
  modnum& operator/=(const modnum& o) { return *this *= (~o); }
  friend modnum operator+(const modnum& a, const modnum& b) {
    return modnum(a) += b;
  }
  friend modnum operator-(const modnum& a, const modnum& b) {
    return modnum(a) -= b;
  }
  friend modnum operator*(const modnum& a, const modnum& b) {
    return modnum(a) *= b;
  }
  friend modnum operator/(const modnum& a, const modnum& b) {
    return modnum(a) /= b;
  }
};
using num = modnum<998244353>;
template <typename T>
T pow(T a, long long b) {
  assert(b >= 0);
  T r = 1;
  while (b) {
    if (b & 1) r *= a;
    b >>= 1;
    a *= a;
  }
  return r;
}
vector<num> fact;
vector<num> ifact;
void init() {
  int N = 1100000;
  fact = {1};
  for (int i = 1; i < N; i++) fact.push_back(i * fact[i - 1]);
  ifact.resize(N);
  ifact.back() = 1 / fact.back();
  for (int i = N - 1; i > 0; i--) ifact[i - 1] = i * ifact[i];
}
num ncr(int n, int k) {
  if (k < 0 || k > n) return 0;
  return fact[n] * ifact[k] * ifact[n - k];
}
int main() {
  ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  init();
  int n, k;
  cin >> n >> k;
  vector<int> A(n);
  for (int i = 0; i < n; i++) cin >> A[i];
  int same = 0;
  for (int i = 0; i < n; i++)
    if (A[i] == A[(i + 1) % n]) same++;
  int diff = n - same;
  num ans = 0;
  for (int a = 0; a * 2 <= diff; a++) {
    ans += ncr(diff, a) * ncr(diff - a, a) * pow(num(k - 2), diff - a - a);
  }
  ans = (pow(num(k), diff) - ans) / 2;
  ans = ans * pow(num(k), same);
  cout << (int)ans << '\n';
}
