#include using namespace std; using ll=long long; #define rep(i,n) for(int i=0;i=0;i--) #define all(v) v.begin(),v.end() #define rall(v) v.rbegin(),v.rend() template bool chmax(T &a, T b){if (a < b){a = b;return true;} else return false;} template bool chmin(T &a, T b){if (a > b){a = b;return true;} else return false;} const int MAX=1e6+10; const ll MOD=998244353; vectorfac(MAX),finv(MAX),inv(MAX); void set_fac(){ fac[0]=fac[1]=1; finv[0]=finv[1]=1; inv[1]=1; for (int i=2;i>n>>m; ll ans=1; rep(i,m){ ans*=i+1; ans%=MOD; } rep(i,n){ if(i