結果

問題 No.1011 Infinite Stairs
ユーザー はまやんはまやんはまやんはまやん
提出日時 2020-03-21 10:23:05
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 157 ms / 2,000 ms
コード長 3,539 bytes
コンパイル時間 2,304 ms
コンパイル使用メモリ 202,472 KB
実行使用メモリ 242,632 KB
最終ジャッジ日時 2024-07-17 11:59:23
合計ジャッジ時間 5,352 ms
ジャッジサーバーID
(参考情報)
judge5 / judge1
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 64 ms
242,500 KB
testcase_01 AC 64 ms
242,500 KB
testcase_02 AC 66 ms
242,500 KB
testcase_03 AC 125 ms
242,508 KB
testcase_04 AC 74 ms
242,508 KB
testcase_05 AC 157 ms
242,624 KB
testcase_06 AC 65 ms
242,628 KB
testcase_07 AC 66 ms
242,628 KB
testcase_08 AC 64 ms
242,500 KB
testcase_09 AC 65 ms
242,500 KB
testcase_10 AC 65 ms
242,504 KB
testcase_11 AC 79 ms
242,628 KB
testcase_12 AC 66 ms
242,628 KB
testcase_13 AC 71 ms
242,632 KB
testcase_14 AC 63 ms
242,504 KB
testcase_15 AC 77 ms
242,504 KB
testcase_16 AC 106 ms
242,504 KB
testcase_17 AC 66 ms
242,500 KB
testcase_18 AC 88 ms
242,504 KB
testcase_19 AC 64 ms
242,500 KB
testcase_20 AC 62 ms
242,500 KB
testcase_21 AC 75 ms
242,500 KB
testcase_22 AC 85 ms
242,500 KB
testcase_23 AC 77 ms
242,500 KB
testcase_24 AC 78 ms
242,624 KB
testcase_25 AC 84 ms
242,504 KB
testcase_26 AC 69 ms
242,628 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>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()
//#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
typedef long long ll; const int inf = INT_MAX / 2; const ll infl = 1LL << 60;
template<class T>bool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; }
//---------------------------------------------------------------------------------------------------
template<int MOD> struct ModInt {
    static const int Mod = MOD; unsigned x; ModInt() : x(0) { }
    ModInt(signed sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    ModInt(signed long long sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    int get() const { return (int)x; }
    ModInt& operator+=(ModInt that) { if ((x += that.x) >= MOD) x -= MOD; return *this; }
    ModInt& operator-=(ModInt that) { if ((x += MOD - that.x) >= MOD) x -= MOD; return *this; }
    ModInt& operator*=(ModInt that) { x = (unsigned long long)x * that.x % MOD; return *this; }
    ModInt& operator/=(ModInt that) { return *this *= that.inverse(); }
    ModInt operator+(ModInt that) const { return ModInt(*this) += that; }
    ModInt operator-(ModInt that) const { return ModInt(*this) -= that; }
    ModInt operator*(ModInt that) const { return ModInt(*this) *= that; }
    ModInt operator/(ModInt that) const { return ModInt(*this) /= that; }
    ModInt inverse() const {
        long long a = x, b = MOD, u = 1, v = 0;
        while (b) { long long t = a / b; a -= t * b; std::swap(a, b); u -= t * v; std::swap(u, v); }
        return ModInt(u);
    }
    bool operator==(ModInt that) const { return x == that.x; }
    bool operator!=(ModInt that) const { return x != that.x; }
    ModInt operator-() const { ModInt t; t.x = x == 0 ? 0 : Mod - x; return t; }
};
template<int MOD> ostream& operator<<(ostream& st, const ModInt<MOD> a) { st << a.get(); return st; };
template<int MOD> ModInt<MOD> operator^(ModInt<MOD> a, unsigned long long k) {
    ModInt<MOD> r = 1; while (k) { if (k & 1) r *= a; a *= a; k >>= 1; } return r;
}
typedef ModInt<1000000007> mint;
/*---------------------------------------------------------------------------------------------------
            ∧_∧
      ∧_∧  (´<_` )  Welcome to My Coding Space!
     ( ´_ゝ`) /  ⌒i     @hamayanhamayan0
    /   \     | |
    /   / ̄ ̄ ̄ ̄/  |
  __(__ニつ/     _/ .| .|____
     \/____/ (u ⊃
---------------------------------------------------------------------------------------------------*/














int N, d, K;
mint dp[303][101010];
mint tot[303][101010];
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> N >> d >> K;
    
    dp[0][0] = 1;
    rep(turn, 0, N) {
        tot[turn][0] = dp[turn][0];
        rep(i, 1, K + 1) tot[turn][i] = dp[turn][i] + tot[turn][i - 1];
        rep(i, 1, K + 1) {
            dp[turn + 1][i] = tot[turn][i - 1];
            if (0 <= i - d - 1) dp[turn + 1][i] -= tot[turn][i - d - 1];
        }
    }

    cout << dp[N][K] << endl;
}





0