#include using namespace std; typedef signed long long ll; #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define FORR2(x,y,arr) for(auto& [x,y]:arr) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) template bool chmax(T &a, const T &b) { if(a bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;} //------------------------------------------------------- int N; ll A[101010]; const ll mo=998244353; ll modpow(ll a, ll n = mo-2) { ll r=1;a%=mo; while(n) r=r*((n%2)?a:1)%mo,a=a*a%mo,n>>=1; return r; } ll I[3][101010]; void solve() { int i,j,k,l,r,x,y; string s; cin>>N; FOR(i,N) cin>>A[i]; I[2][0]=modpow(6); I[0][1]=1; I[1][1]=mo-modpow(2); for(i=2;i<=N+2;i++) { I[0][i]=I[0][i-2]*(i-1)%mo*modpow(i)%mo; I[1][i]=I[1][i-2]*(i-1)%mo*modpow(i)%mo; I[2][i]=I[2][i-2]*(i-1)%mo*modpow(i)%mo; (I[1][i]+=mo-modpow(i*modpow(2,i)%mo))%=mo; } ll ret[3]={}; FOR(i,N) { ll p=A[i]*modpow(2,i+1)%mo; (ret[0]+=p*I[0][i])%=mo; (ret[1]+=p*I[1][i])%=mo; (ret[2]+=p*I[2][i])%=mo; } cout<