#include using namespace std; using Int = long long; const char newl = '\n'; template inline void chmin(T1 &a,T2 b){if(a>b) a=b;} template inline void chmax(T1 &a,T2 b){if(a void drop(const T &x){cout< vector read(size_t n){ vector ts(n); for(size_t i=0;i>ts[i]; return ts; } template struct Mint{ inline static constexpr T mod = MOD; T v; Mint():v(0){} Mint(signed v):v(v){} Mint(long long t){v=t%MOD;if(v<0) v+=MOD;} Mint pow(long long k){ Mint res(1),tmp(v); while(k){ if(k&1) res*=tmp; tmp*=tmp; k>>=1; } return res; } static Mint add_identity(){return Mint(0);} static Mint mul_identity(){return Mint(1);} Mint inv(){return pow(MOD-2);} Mint& operator+=(Mint a){v+=a.v;if(v>=MOD)v-=MOD;return *this;} Mint& operator-=(Mint a){v+=MOD-a.v;if(v>=MOD)v-=MOD;return *this;} Mint& operator*=(Mint a){v=1LL*v*a.v%MOD;return *this;} Mint& operator/=(Mint a){return (*this)*=a.inv();} Mint operator+(Mint a) const{return Mint(v)+=a;} Mint operator-(Mint a) const{return Mint(v)-=a;} Mint operator*(Mint a) const{return Mint(v)*=a;} Mint operator/(Mint a) const{return Mint(v)/=a;} Mint operator+() const{return *this;} Mint operator-() const{return v?Mint(MOD-v):Mint(v);} bool operator==(const Mint a)const{return v==a.v;} bool operator!=(const Mint a)const{return v!=a.v;} static Mint comb(long long n,Int k){ Mint num(1),dom(1); for(Int i=0;i ostream& operator<<(ostream &os,Mint m){os< vector powers(Int n,T x){ vector po(n+1,T(1)); for(Int i=0;i class BIT{ private: // \sum_{j < i} v[j] T sum(Int i){ T s(0); for(Int x=i;x>0;x-=(x&-x)) s+=bit[x]; return s; } public: Int n; vector bit; BIT(Int n_):n(n_+1),bit(n_+2,0){} // v[i] += a void add(Int i,T a){ for(Int x=++i;x<=n;x+=(x&-x)) bit[x]+=a; } // \sum_{l <= i < r} v[i] T query(Int l,Int r){return sum(r)-sum(l);} // min({x | sum(x) >= w}) Int lower_bound(const T w){ if(w<=0) return 0; T r=w; Int x=0,p=1; while(p0;k>>=1){ if(x+k<=n and bit[x+k]=w); return x; } // min({x | sum(x) > w}) Int upper_bound(T w){return lower_bound(w+1);} }; //INSERT ABOVE HERE signed main(){ cin.tie(0); ios::sync_with_stdio(0); Int n; cin>>n; auto ps=read(n); using M = Mint; auto po=powers(n+n,M(2)); M ans{0}; BIT bit1(n+1); BIT bit2(n+1); for(Int i=0;i