結果

問題 No.2857 Div Array
ユーザー dyktr_06dyktr_06
提出日時 2024-05-09 22:35:33
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
RE  
実行時間 -
コード長 3,502 bytes
コンパイル時間 1,921 ms
コンパイル使用メモリ 200,596 KB
実行使用メモリ 16,512 KB
最終ジャッジ日時 2024-05-09 22:35:40
合計ジャッジ時間 6,136 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge2
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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 7 ms
16,512 KB
testcase_01 AC 7 ms
11,136 KB
testcase_02 AC 7 ms
11,136 KB
testcase_03 AC 7 ms
11,136 KB
testcase_04 AC 7 ms
11,136 KB
testcase_05 AC 7 ms
11,136 KB
testcase_06 AC 7 ms
11,264 KB
testcase_07 AC 7 ms
11,136 KB
testcase_08 AC 7 ms
11,136 KB
testcase_09 AC 8 ms
11,264 KB
testcase_10 RE -
testcase_11 TLE -
testcase_12 -- -
testcase_13 -- -
testcase_14 -- -
testcase_15 -- -
testcase_16 -- -
testcase_17 -- -
testcase_18 -- -
testcase_19 -- -
testcase_20 -- -
testcase_21 -- -
testcase_22 -- -
testcase_23 -- -
testcase_24 -- -
testcase_25 -- -
testcase_26 -- -
testcase_27 -- -
testcase_28 -- -
testcase_29 -- -
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ソースコード

diff # 

#include <bits/stdc++.h>
using namespace std;

template <long long Modulus>
struct ModInt{
    long long val;
    constexpr ModInt(const long long _val = 0) noexcept : val(_val) {
        normalize();
    }
    void normalize(){
        val = (val % Modulus + Modulus) % Modulus;
    }
    inline ModInt &operator+=(const ModInt &rhs) noexcept {
        if(val += rhs.val, val >= Modulus) val -= Modulus;
        return *this;
    }
    inline ModInt &operator-=(const ModInt &rhs) noexcept {
        if(val -= rhs.val, val < 0) val += Modulus;
        return *this;
    }
    inline ModInt &operator*=(const ModInt &rhs) noexcept {
        val = val * rhs.val % Modulus;
        return *this;
    }
    inline ModInt &operator/=(const ModInt &rhs) noexcept {
        val = val * inv(rhs.val).val % Modulus;
        return *this;
    }
    inline ModInt &operator++() noexcept {
        if(++val >= Modulus) val -= Modulus;
        return *this;
    }
    inline ModInt operator++(int) noexcept {
        ModInt t = val;
        if(++val >= Modulus) val -= Modulus;
        return t;
    }
    inline ModInt &operator--() noexcept {
        if(--val < 0) val += Modulus;
        return *this;
    }
    inline ModInt operator--(int) noexcept {
        ModInt t = val;
        if(--val < 0) val += Modulus;
        return t;
    }
    inline ModInt operator-() const noexcept { return (Modulus - val) % Modulus; }
    inline ModInt inv(void) const { return inv(val); }
    ModInt pow(long long n){
        assert(0 <= n);
        ModInt x = *this, r = 1;
        while(n){
            if(n & 1) r *= x;
            x *= x;
            n >>= 1;
        }
        return r;
    }
    ModInt inv(const long long n) const {
        long long a = n, b = Modulus, u = 1, v = 0;
        while(b){
            long long t = a / b;
            a -= t * b; swap(a, b);
            u -= t * v; swap(u, v);
        }
        u %= Modulus;
        if(u < 0) u += Modulus;
        return u;
    }
    friend inline ModInt operator+(const ModInt &lhs, const ModInt &rhs) noexcept { return ModInt(lhs) += rhs; }
    friend inline ModInt operator-(const ModInt &lhs, const ModInt &rhs) noexcept { return ModInt(lhs) -= rhs; }
    friend inline ModInt operator*(const ModInt &lhs, const ModInt &rhs) noexcept { return ModInt(lhs) *= rhs; }
    friend inline ModInt operator/(const ModInt &lhs, const ModInt &rhs) noexcept { return ModInt(lhs) /= rhs; }
    friend inline bool operator==(const ModInt &lhs, const ModInt &rhs) noexcept { return lhs.val == rhs.val; }
    friend inline bool operator!=(const ModInt &lhs, const ModInt &rhs) noexcept { return lhs.val != rhs.val; }
    friend inline istream &operator>>(istream &is, ModInt &x) noexcept {
        is >> x.val;
        x.normalize();
        return is;
    }
    friend inline ostream &operator<<(ostream &os, const ModInt &x) noexcept { return os << x.val; }
};

using mint = ModInt<998244353>;

mint dp[1001][1001];

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    long long n, m, k;
    cin >> n >> m >> k;

    for(int i = 1; i <= m; i++){
        dp[1][m / i] += 1;
    }

    for(int i = 1; i < n; i++){
        for(int j = 1; j <= m; j++){
            for(int l = 1; l <= m; l++){
                if(abs(m / l - j) <= k){
                    dp[i + 1][m / l] += dp[i][j];
                }
            }
        }
    }

    mint ans = 0;
    for(int i = 1; i <= m; i++){
        ans += dp[n][i];
    }
    cout << ans << "\n";
}
0