#pragma optimize("Ofast") #pragma target("avx2") #include using namespace std; #include using mint=atcoder::static_modint<998244353>; #define endl '\n' using lint=long long; #define all(n) (n).begin(),(n).end() int main(){ cin.tie(0)->sync_with_stdio(0); int n; cin>>n; vectora(n); for(int i=0;i>a[i]; vector>s(n+1); s[0].emplace_back(0); for(int i=0;idp={1}; for(int i=0;i>g; for(auto d:s[i]){ for(auto e:s[i]){ if(ddp2(s[i+1].size()); auto get=[&](const vector&x,int i){ return lower_bound(all(x),i)-x.begin(); }; for(auto [p,q]:g){ dp2[get(s[i+1],q)]+=dp[get(s[i],p)]; if(i+1==n)ans+=dp[get(s[i],p)]; } swap(dp,dp2); } cout<