#line 2 "/Users/kaage/Desktop/ProgrammingWorkspace/library/other/template.hpp"
#define _CRT_SECURE_NO_WARNINGS
#pragma target("avx2")
#pragma optimize("O3")
#pragma optimize("unroll-loops")
#include <algorithm>
#include <bitset>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <string.h>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#define rep(i,n) for(int i=0;i<(n);i++)
#define REP(i,n) for(int i=1;i<=(n);i++)
#define all(V) V.begin(),V.end()
typedef unsigned int uint;
typedef long long lint;
typedef unsigned long long ulint;
typedef std::pair<int, int> P;
typedef std::pair<lint, lint> LP;
constexpr int INF = INT_MAX/2;
constexpr lint LINF = LLONG_MAX/2;
constexpr double eps = DBL_EPSILON;
constexpr double PI=3.141592653589793238462643383279;
template<class T>
class prique :public std::priority_queue<T, std::vector<T>, std::greater<T>> {};
template <class T, class U>
inline bool chmax(T& lhs, const U& rhs) {
	if (lhs < rhs) {
		lhs = rhs;
		return 1;
	}
	return 0;
}
template <class T, class U>
inline bool chmin(T& lhs, const U& rhs) {
	if (lhs > rhs) {
		lhs = rhs;
		return 1;
	}
	return 0;
}
inline lint gcd(lint a, lint b) {
	while (b) {
		lint c = a;
		a = b; b = c % b;
	}
	return a;
}
inline lint lcm(lint a, lint b) {
	return a / gcd(a, b) * b;
}
bool isprime(lint n) {
	if (n == 1)return false;
	for (int i = 2; i * i <= n; i++) {
		if (n % i == 0)return false;
	}
	return true;
}
template<typename T>
T mypow(T a, lint b) {
	T res(1);
	while(b){
		if(b&1)res*=a;
		a*=a;
		b>>=1;
	}
	return res;
}
lint modpow(lint a, lint b, lint m) {
	lint res(1);
	while(b){
		if(b&1){
			res*=a;res%=m;
		}
		a*=a;a%=m;
		b>>=1;
	}
	return res;
}
template<typename T>
void printArray(std::vector<T>& vec) {
	rep(i, vec.size()){
		std::cout << vec[i];
		std::cout<<(i==(int)vec.size()-1?"\n":" ");
	}
}
template<typename T>
void printArray(T l, T r) {
	T rprev = std::prev(r);
	for (T i = l; i != rprev; i++) {
		std::cout << *i << " ";
	}
	std::cout << *rprev << std::endl;
}
LP extGcd(lint a,lint b) {
	if(b==0)return {1,0};
	LP s=extGcd(b,a%b);
	std::swap(s.first,s.second);
	s.second-=a/b*s.first;
	return s;
}
LP ChineseRem(const lint& b1,const lint& m1,const lint& b2,const lint& m2) {
	lint p=extGcd(m1,m2).first;
	lint tmp=(b2-b1)*p%m2;
	lint r=(b1+m1*tmp+m1*m2)%(m1*m2);
	return std::make_pair(r,m1*m2);
}
template<typename F>
inline constexpr decltype(auto) lambda_fix(F&& f){
	return [f=std::forward<F>(f)](auto&&... args){
		return f(f,std::forward<decltype(args)>(args)...);
	};
}
#line 3 "/Users/kaage/Desktop/ProgrammingWorkspace/library/algebraic/DynamicModInt.hpp"
class DynamicModInt {
	lint value;
public:
	static unsigned int modulo;
	DynamicModInt() : value(0) {}
	template<typename T>
	DynamicModInt(T value = 0) : value(value) {
		if (value < 0)value = -(lint)(-value % modulo) + modulo;
		this->value = value % modulo;
	}
	static inline void setMod(const unsigned int& mod){modulo=mod;}
	inline DynamicModInt inv()const{return mypow(*this,modulo-2);}
	inline operator int()const { return value; }
	inline DynamicModInt& operator+=(const DynamicModInt& x) {
		value += x.value;
		if (value >= modulo)value -= modulo;
		return *this;
	}
	inline DynamicModInt& operator++() {
		if (value == modulo - 1)value = 0;
		else value++;
		return *this;
	}
	inline DynamicModInt operator++(int){
		DynamicModInt res=*this;
		--*this;
		return res;
	}
	inline DynamicModInt operator-()const {
		return DynamicModInt(0) -= *this;
	}
	inline DynamicModInt& operator-=(const DynamicModInt& x) {
		value -= x.value;
		if (value < 0)value += modulo;
		return *this;
	}
	inline DynamicModInt& operator--() {
		if (value == 0)value = modulo - 1;
		else value--;
		return *this;
	}
	inline DynamicModInt operator--(int){
		DynamicModInt res=*this;
		--*this;
		return res;
	}
	inline DynamicModInt& operator*=(const DynamicModInt& x) {
		value = value * x.value % modulo;
		return *this;
	}
	inline DynamicModInt& operator/=(const DynamicModInt& rhs) {
		return *this*=rhs.inv();
	}
	template<typename T> DynamicModInt operator+(const T& rhs)const { return DynamicModInt(*this) += rhs; }
	template<typename T> DynamicModInt& operator+=(const T& rhs) { return operator+=(DynamicModInt(rhs)); }
	template<typename T> DynamicModInt operator-(const T& rhs)const { return DynamicModInt(*this) -= rhs; }
	template<typename T> DynamicModInt& operator-=(const T& rhs) { return operator-=(DynamicModInt(rhs)); }
	template<typename T> DynamicModInt operator*(const T& rhs)const { return DynamicModInt(*this) *= rhs; }
	template<typename T> DynamicModInt& operator*=(const T& rhs) { return operator*=(DynamicModInt(rhs)); }
	template<typename T> DynamicModInt operator/(const T& rhs)const { return DynamicModInt(*this) /= rhs; }
	template<typename T> DynamicModInt& operator/=(const T& rhs) { return operator/=(DynamicModInt(rhs)); }
};
unsigned int DynamicModInt::modulo=1000000007;
std::istream& operator>>(std::istream& ist, DynamicModInt& x) {
	lint a;
	ist >> a;
	x = a;
	return ist;
}
#line 4 "/Users/kaage/Desktop/ProgrammingWorkspace/library/algebraic/StaticModInt.hpp"
template<unsigned int modulo>
class StaticModInt {
	lint value;
public:
	StaticModInt() : value(0) {}
	template<typename T>
	StaticModInt(T value = 0) : value(value) {
		if (value < 0)value = -(lint)(-value % modulo) + modulo;
		this->value = value % modulo;
	}
	inline StaticModInt inv()const{return mypow(*this,modulo-2);}
	inline operator int()const { return value; }
	inline StaticModInt& operator+=(const StaticModInt& x) {
		value += x.value;
		if (value >= modulo)value -= modulo;
		return *this;
	}
	inline StaticModInt& operator++() {
		if (value == modulo - 1)value = 0;
		else value++;
		return *this;
	}
	inline StaticModInt operator++(int){
		StaticModInt res=*this;
		--*this;
		return res;
	}
	inline StaticModInt operator-()const {
		return StaticModInt(0) -= *this;
	}
	inline StaticModInt& operator-=(const StaticModInt& x) {
		value -= x.value;
		if (value < 0)value += modulo;
		return *this;
	}
	inline StaticModInt& operator--() {
		if (value == 0)value = modulo - 1;
		else value--;
		return *this;
	}
	inline StaticModInt operator--(int){
		StaticModInt res=*this;
		--*this;
		return res;
	}
	inline StaticModInt& operator*=(const StaticModInt& x) {
		value = value * x.value % modulo;
		return *this;
	}
	inline StaticModInt& operator/=(const StaticModInt& rhs) {
		return *this*=rhs.inv();
	}
	template<typename T> StaticModInt operator+(const T& rhs)const { return StaticModInt(*this) += rhs; }
	template<typename T> StaticModInt& operator+=(const T& rhs) { return operator+=(StaticModInt(rhs)); }
	template<typename T> StaticModInt operator-(const T& rhs)const { return StaticModInt(*this) -= rhs; }
	template<typename T> StaticModInt& operator-=(const T& rhs) { return operator-=(StaticModInt(rhs)); }
	template<typename T> StaticModInt operator*(const T& rhs)const { return StaticModInt(*this) *= rhs; }
	template<typename T> StaticModInt& operator*=(const T& rhs) { return operator*=(StaticModInt(rhs)); }
	template<typename T> StaticModInt operator/(const T& rhs)const { return StaticModInt(*this) /= rhs; }
	template<typename T> StaticModInt& operator/=(const T& rhs) { return operator/=(StaticModInt(rhs)); }
};
template<unsigned int modulo>
std::istream& operator>>(std::istream& ist, StaticModInt<modulo>& x) {
	lint a;
	ist >> a;
	x = a;
	return ist;
}
#line 3 "/Users/kaage/Desktop/ProgrammingWorkspace/library/data-structure/BIT.hpp"
template<typename T>
class BIT {
	int n;
	std::vector<T> bit;
private:
	T query(int a) {
		T cnt = 0;
		while (a > 0) {
			cnt += bit[a];
			a -= a & -a;
		}
		return cnt;
	}
public:
	BIT(int n) :n(n) {bit.resize(n + 1);}
	void add(int a, T x) {
		a++;
		while (a <= n) {
			bit[a] += x;
			a += a & -a;
		}
	}
	T query(int l, int r) {return query(r) - query(l);}
	void clear() {bit.assign(n + 1, 0);}
	int lower_bound(T x){
		int p=0,k=1;
		while(k*2<=n)k*=2;
		while(k>0){
			if(p+k<=n&&bit[p+k]<x){
				x-=bit[p+k];
				p+=k;
			}
			k/=2;
		}
		return p;
	}
	int upper_bound(T x){
		int p=0,k=1;
		while(k*2<=n)k*=2;
		while(k>0){
			if(p+k<=n&&bit[p+k]<=x){
				x-=bit[p+k];
				p+=k;
			}
			k/=2;
		}
		return p;
	}
};
#line 4 "main.cpp"
using ModInt=StaticModInt<998244353>;
int N,K,p[200010];
int main(){
	std::cin>>N>>K;
	rep(i,N)std::cin>>p[i];
	ModInt ans=ModInt(K)*(K-1)/4;

	std::vector<int> vec(N+1);
	rep(i,K)vec[p[i]]++;
	REP(i,N)vec[i]+=vec[i-1];
	ModInt co=ModInt(K-1)/K,now=co;
	for(int i=K;i<N;i++){
		ans+=ModInt(1-now/2)*(vec[N]-vec[p[i]]);
		ans+=now/2*vec[p[i]];
		now*=co;
	}

	BIT<ModInt> bit1(N+1),bit2(N+1);
	now=mypow(co,K);
	ModInt co2=ModInt(1)/co,now2=mypow(co2,K)/2;
	for(int i=K;i<N;i++){
		ans+=bit1.query(0,p[i])*now;
		ans+=bit2.query(p[i],N+1)*now;
		bit1.add(p[i],now2);
		bit2.add(p[i],-now2);
		now*=co;now2*=co2;
	}

	bit1.clear();
	for(int i=K;i<N;i++){
		ans+=bit1.query(p[i],N+1);
		bit1.add(p[i],1);
	}
	std::cout<<ans<<std::endl;
	return 0;
}

Measured memory_bytes: 7952