#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl; #define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl; template inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; } template inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; } using namespace std; typedef long long ll; template vector> vec2d(int n, int m, T v){ return vector>(n, vector(m, v)); } template vector>> vec3d(int n, int m, int k, T v){ return vector>>(n, vector>(m, vector(k, v))); } template void print_vector(vector v, char delimiter=' '){ if(v.empty()) { cout << endl; return; } for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter; cout << v.back() << endl; } using mint = atcoder::modint998244353; //1-indexed template struct bit{ int n; vector data; bit(int n_){ n = 1; while(n < n_) n *= 2; data = vector(n+1); for(int i = 0; i <= n; i++) data[i] = 0; } T sum(int i){ T ret = 0; while(i > 0){ ret += data[i]; i -= i&-i; } return ret; } void add(int i, T x){ while(i <= n){ data[i] += x; i += i&-i; } } }; ostream& operator<<(ostream& os, const mint& m){ os << m.val(); return os; } mint op(mint x, mint y){ return x+y; } mint e(){ return mint(0); } using Seg = atcoder::segtree; int main(){ ios::sync_with_stdio(false); cin.tie(0); cout << setprecision(10) << fixed; int n; cin >> n; vector p(n); bit bt(n); for(int i = 0; i < n; i++){ cin >> p[i]; p[i]--; } mint ans = 0; Seg seg(n); for(int i = 0; i < n; i++){ mint sum = seg.prod(p[i]+1, n); int inv = bt.sum(n)-bt.sum(p[i]); ans += mint(2).pow(n-1)*inv; ans -= sum*mint(2).pow(n-i-1); seg.set(p[i], mint(2).pow(i)); bt.add(p[i]+1, 1); } cout << ans << endl; }