#include using namespace atcoder; #include #define all(a) (a.begin()),(a.end()) #define rall(a) (a.rbegin()),(a.rend()) using namespace std; using ll=long long; using ld=long double; using pll=pair; templatebool chmax(T &a, const T &b) {if(abool chmin(T &a, const T &b) {if(b> (istream& is, modint1000000007& x) { unsigned int t; is >> t; x=t; return is; } istream& operator >> (istream& is, modint998244353& x) { unsigned int t; is >> t; x=t; return is; } istream& operator >> (istream& is, modint& x) { unsigned int t; is >> t; x=t; return is; } ostream& operator << (ostream& os, const modint1000000007& x) { os << x.val(); return os; } ostream& operator << (ostream& os, const modint998244353& x) { os << x.val(); return os; } ostream& operator << (ostream& os, const modint& x) { os << x.val(); return os; } templateistream& operator >> (istream& is, pair& p) { is >> p.first >> p.second; return is; } templateostream& operator << (ostream& os, const pair& p) { os << p.first << " " << p.second; return os;} templateistream& operator >> (istream& is, vector& v) { for(T& x:v) is >> x; return is; } templateostream& operator << (ostream& os, const vector& v) {for(int i=0;i void pt() { std::cout << "\n"; } template void pt_rest() { std::cout << "\n"; } template void pt_rest(const T& first, const A&... rest) { std::cout << " " << first; pt_rest(rest...); } template void pt(const T& first, const A&... rest) { std::cout << first; pt_rest(rest...); } template void resize(vector& vec, const H head){ vec.resize(head); } template void resize(vector& vec, const H& head, const T ... tail){ vec.resize(head); for(auto& v: vec) resize(v, tail...); } template void fill(V& x, const T& val){ x = val; } template void fill(vector& vec, const T& val){ for(auto& v: vec) fill(v, val); } template void input_set(istream& is, const int idx, vector& head){ is >> head[idx]; } template void input_set(istream& is, const int idx, vector& head, T& ... tail){ input_set(is >> head[idx], idx, tail...); } template void input_set(istream& is, vector& head, T& ... tail){ for(int i=0; i void input_set(vector& head, T& ... tail){ input_set(cin, head, tail...); } static const ll inf=1e18+7; static const ld pi=acos(-1); static const ld eps=1e-10; using v1=vector; using v2=vector; using v3=vector; using v4=vector; using mint=modint998244353; int main(void) { cin.tie(nullptr); ios::sync_with_stdio(false); ll N;cin>>N; v1 a(N);cin>>a; vectordp;resize(dp,N+1); dp[0]=1; for(ll i=0;ia[i])l--; while(r