結果

問題 No.2891 Mint
ユーザー shkiiii_shkiiii_
提出日時 2024-09-14 07:34:08
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 54 ms / 2,000 ms
コード長 3,867 bytes
コンパイル時間 2,160 ms
コンパイル使用メモリ 201,600 KB
実行使用メモリ 5,376 KB
最終ジャッジ日時 2024-09-14 07:34:20
合計ジャッジ時間 4,731 ms
ジャッジサーバーID
(参考情報)
judge1 / judge6
このコードへのチャレンジ
(要ログイン)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
5,248 KB
testcase_01 AC 2 ms
5,376 KB
testcase_02 AC 2 ms
5,376 KB
testcase_03 AC 2 ms
5,376 KB
testcase_04 AC 23 ms
5,376 KB
testcase_05 AC 2 ms
5,376 KB
testcase_06 AC 54 ms
5,376 KB
testcase_07 AC 2 ms
5,376 KB
testcase_08 AC 2 ms
5,376 KB
testcase_09 AC 2 ms
5,376 KB
testcase_10 AC 2 ms
5,376 KB
testcase_11 AC 2 ms
5,376 KB
testcase_12 AC 2 ms
5,376 KB
testcase_13 AC 2 ms
5,376 KB
testcase_14 AC 2 ms
5,376 KB
testcase_15 AC 2 ms
5,376 KB
testcase_16 AC 2 ms
5,376 KB
testcase_17 AC 40 ms
5,376 KB
testcase_18 AC 25 ms
5,376 KB
testcase_19 AC 22 ms
5,376 KB
testcase_20 AC 36 ms
5,376 KB
testcase_21 AC 22 ms
5,376 KB
testcase_22 AC 45 ms
5,376 KB
testcase_23 AC 16 ms
5,376 KB
testcase_24 AC 35 ms
5,376 KB
testcase_25 AC 48 ms
5,376 KB
testcase_26 AC 46 ms
5,376 KB
testcase_27 AC 45 ms
5,376 KB
testcase_28 AC 51 ms
5,376 KB
testcase_29 AC 24 ms
5,376 KB
testcase_30 AC 38 ms
5,376 KB
testcase_31 AC 25 ms
5,376 KB
testcase_32 AC 40 ms
5,376 KB
testcase_33 AC 29 ms
5,376 KB
testcase_34 AC 32 ms
5,376 KB
testcase_35 AC 36 ms
5,376 KB
testcase_36 AC 39 ms
5,376 KB
testcase_37 AC 18 ms
5,376 KB
testcase_38 AC 16 ms
5,376 KB
testcase_39 AC 20 ms
5,376 KB
testcase_40 AC 21 ms
5,376 KB
testcase_41 AC 12 ms
5,376 KB
testcase_42 AC 1 ms
5,376 KB
testcase_43 AC 2 ms
5,376 KB
testcase_44 AC 1 ms
5,376 KB
testcase_45 AC 2 ms
5,376 KB
testcase_46 AC 2 ms
5,376 KB
testcase_47 AC 19 ms
5,376 KB
testcase_48 AC 19 ms
5,376 KB
testcase_49 AC 22 ms
5,376 KB
testcase_50 AC 8 ms
5,376 KB
testcase_51 AC 17 ms
5,376 KB
testcase_52 AC 7 ms
5,376 KB
testcase_53 AC 14 ms
5,376 KB
testcase_54 AC 15 ms
5,376 KB
testcase_55 AC 4 ms
5,376 KB
testcase_56 AC 22 ms
5,376 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

#include<bits/stdc++.h>
// #include<atcoder/all>
// #include<boost/multiprecision/cpp_int.hpp>

using namespace std;
// using namespace atcoder;
// using bint = boost::multiprecision::cpp_int;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using P = pair<ll,ll>;
using vi = vector<ll>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using ve = vector<vector<int>>;
using vb = vector<bool>;
using vvb = vector<vb>;
#define rep(i,n) for(ll i = 0;i < (ll)n;i++)
#define ALL(x) (x).begin(),(x).end()
#define sz(c) ((ll)(c).size())
#define LB(A,x) (int)(lower_bound(A.begin(),A.end(),x)-A.begin())
#define UB(A,x) (int)(upper_bound(A.begin(),A.end(),x)-A.begin())
// #define MOD 1000000007
#define MOD 998244353
template<typename T>using min_priority_queue=priority_queue<T,vector<T>,greater<T>>;
template<typename T>ostream&operator<<(ostream&os,vector<T>&v){for(int i = 0;i < v.size();i++)os<<v[i]<<(i+1!=v.size()?" ":"");return os;}
template<typename T>istream&operator>>(istream&is,vector<T>&v){for(T&in:v)is>>in;return is;}
template<typename T1,typename T2>ostream&operator<<(ostream&os,pair<T1,T2>&p){os<<p.first<<" "<<p.second;return os;}
template<typename T1,typename T2>istream&operator>>(istream&is,pair<T1,T2>&p){is>>p.first>>p.second;return is;}
template<typename T> inline bool chmax(T &a,T b){if(a < b){a = b;return true;}return false;}
template<typename T> inline bool chmin(T &a,T b){if(a > b){a = b;return true;}return false;}
ld dist(ld x1,ld y1,ld x2, ld y2){return sqrtl((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));}


template< int mod >
struct ModInt {
  int x;

  ModInt() : x(0) {}

  ModInt(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}

  ModInt &operator+=(const ModInt &p) {
    if((x += p.x) >= mod) x -= mod;
    return *this;
  }

  ModInt &operator-=(const ModInt &p) {
    if((x += mod - p.x) >= mod) x -= mod;
    return *this;
  }

  ModInt &operator*=(const ModInt &p) {
    x = (int) (1LL * x * p.x % mod);
    return *this;
  }

  ModInt &operator/=(const ModInt &p) {
    *this *= p.inverse();
    return *this;
  }

  ModInt operator-() const { return ModInt(-x); }

  ModInt operator+(const ModInt &p) const { return ModInt(*this) += p; }

  ModInt operator-(const ModInt &p) const { return ModInt(*this) -= p; }

  ModInt operator*(const ModInt &p) const { return ModInt(*this) *= p; }

  ModInt operator/(const ModInt &p) const { return ModInt(*this) /= p; }

  bool operator==(const ModInt &p) const { return x == p.x; }

  bool operator!=(const ModInt &p) const { return x != p.x; }

  ModInt inverse() const {
    int a = x, b = mod, u = 1, v = 0, t;
    while(b > 0) {
      t = a / b;
      swap(a -= t * b, b);
      swap(u -= t * v, v);
    }
    return ModInt(u);
  }

  ModInt pow(int64_t n) const {
    ModInt ret(1), mul(x);
    while(n > 0) {
      if(n & 1) ret *= mul;
      mul *= mul;
      n >>= 1;
    }
    return ret;
  }

  friend ostream &operator<<(ostream &os, const ModInt &p) {
    return os << p.x;
  }

  friend istream &operator>>(istream &is, ModInt &a) {
    int64_t t;
    is >> t;
    a = ModInt< mod >(t);
    return (is);
  }

  static int get_mod() { return mod; }
};

using modint = ModInt< MOD >;
using mvi = vector<modint>;
using mvvi = vector<mvi>;

int main(){
  
  ios_base::sync_with_stdio(0), cin.tie(0);
  ll n,m;cin >> n >> m;
  ll sq = sqrt(m);
  modint res = 0;
  for(ll k = 1;k <= 10*sq;k++){
    if(m/k <= sq || k > n)break;
    res += (m%k);
  }
  modint inv = ((modint)2).inverse();
  for(ll l = 1;l <= sq;l++){
    ll a = m/l,b = m/(l+1)+1;
    if(b > n || b > a)continue;
    chmin(a,n);
    // cout << a << " " << b << " a\n";
    res += (m%MOD)*((a-b+1)%MOD)%MOD;
    modint k = l*((a-b+1)%MOD)%MOD;
    k = k*((a+b)%MOD);k *= inv;
    res -= k;
  }
  if(n > m)res += (m%MOD)*((n-m)%MOD)%MOD;
  cout << res << "\n";
  

  return 0;
}
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