#include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; typedef long long ll; const int inf=1<<30; const ll INF=1LL<<62; using P=pair; typedef pair PP; const ll MOD=998244353; const int mod = 998244353; struct mint { long long x; // typedef long long long long; mint(long long x=0):x((x%mod+mod)%mod){} mint operator-() const { return mint(-x);} mint& operator+=(const mint a) { if ((x += a.x) >= mod) x -= mod; return *this; } mint& operator-=(const mint a) { if ((x += mod-a.x) >= mod) x -= mod; return *this; } mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;} mint operator+(const mint a) const { return mint(*this) += a;}//後ろのconstはメンバxを変更しないことを示す mint operator-(const mint a) const { return mint(*this) -= a;} mint operator*(const mint a) const { return mint(*this) *= a;} bool operator==(const mint a) const {return a.x==x;} mint pow(unsigned long long int t) const { assert(t>=0); if (!t) return 1; //aがtで割り切れない場合には t%=(mod-1)をして良い mint a = pow(t>>1); a *= a; if (t&1) a *= *this; return a; } // for prime mod mint inv() const { return pow(mod-2);} mint& operator/=(const mint a) { return *this *= a.inv();} mint operator/(const mint a) const { return mint(*this) /= a;} }; std::istream& operator>>(std::istream& is, mint& a) { return is >> a.x;} std::ostream& operator<<(std::ostream& os, const mint& a) { return os << a.x;} struct combination { std::vector fact, ifact; combination(int n):fact(n+1),ifact(n+1) { assert(n < mod); fact[0] = 1; for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i; ifact[n] = fact[n].inv(); for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i; } mint operator()(int n, int k) { if (k < 0 || k > n) return 0; return fact[n]*ifact[k]*ifact[n-k]; } }; int main(){ int N,W; cin>>N>>W; vector v(N),w(N); vector

vw(N); for(int i=0;i>vw[i].first>>vw[i].second; } sort(vw.begin(),vw.end(), [&](P& a,P& b){ //重さの昇順 return a.second; int OFFSET=10000; const int MAXW = 2*10000 + OFFSET;//負の重さ vector> dp(N+3,vector(MAXW+5,X{-INF,0})); dp[0][OFFSET+0]=X{0,1}; auto f=[&](X x,X y){ if(x.first!=y.first){ if(x.firsty.first return x; } return X{x.first,x.second+y.second}; }; for(int i=0;i=0 && j-w<=2*MAXW && dp[i][j-w].first!=-INF) { dp[i+1][j]=f(dp[i][j],X{dp[i][j-w].first+v,dp[i][j-w].second}); } } } X ans{-INF,0}; for(int j=0;j<=W+OFFSET;j++){ ans=f(ans,dp[N][j]); } cout<