func_code_string: #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 ;   }   