#include #pragma GCC optimize("Ofast") //#pragma GCC target("avx2") #pragma GCC optimize("unroll-loops") using namespace std; //#include //#include //namespace mp=boost::multiprecision; //#define mulint mp::cpp_int //#define mulfloat mp::cpp_dec_float_100 struct __INIT{__INIT(){cin.tie(0);ios::sync_with_stdio(false);cout<=0;(i)--) #define flc(x) __builtin_popcountll(x) #define pint pair #define pdouble pair #define plint pair #define fi first #define se second #define all(x) x.begin(),x.end() //#define vec vector #define nep(x) next_permutation(all(x)) typedef long long lint; int dx[8]={1,1,0,-1,-1,-1,0,1}; int dy[8]={0,1,1,1,0,-1,-1,-1}; const int MAX_N=3e5+5; templatebool chmax(T &a,const T &b){if(abool chmin(T &a,const T &b){if(b bucket[MAX_N/1000]; //constexpr int MOD=1000000007; constexpr int MOD=998244353; //typedef __int128_t llint; #include using namespace atcoder; int main(void){ lint N; cin >> N; lint P[N]; rep(i,N) cin >> P[i]; lint ans=0; lint pow2[N+1]; pow2[0]=1; rep(i,N){ pow2[i+1]=pow2[i]*2; pow2[i+1]%=MOD; } rep(i,N){ for(int j=i+1;jP[j])*(pow2[N-1]-pow2[N-1-(j-i)]+MOD); ans%=MOD; } cout << ans << endl; }