結果

問題 No.1011 Infinite Stairs
ユーザー hipopohipopo
提出日時 2020-04-10 18:23:09
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 311 ms / 2,000 ms
コード長 3,278 bytes
コンパイル時間 1,633 ms
コンパイル使用メモリ 143,268 KB
実行使用メモリ 215,808 KB
最終ジャッジ日時 2024-07-17 12:05:04
合計ジャッジ時間 3,746 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
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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 2 ms
6,816 KB
testcase_01 AC 2 ms
6,812 KB
testcase_02 AC 7 ms
6,940 KB
testcase_03 AC 205 ms
143,232 KB
testcase_04 AC 41 ms
26,880 KB
testcase_05 AC 311 ms
215,808 KB
testcase_06 AC 2 ms
6,944 KB
testcase_07 AC 5 ms
6,940 KB
testcase_08 AC 2 ms
6,940 KB
testcase_09 AC 2 ms
6,944 KB
testcase_10 AC 4 ms
6,944 KB
testcase_11 AC 47 ms
31,872 KB
testcase_12 AC 3 ms
6,944 KB
testcase_13 AC 30 ms
20,864 KB
testcase_14 AC 3 ms
6,940 KB
testcase_15 AC 35 ms
25,984 KB
testcase_16 AC 152 ms
101,120 KB
testcase_17 AC 16 ms
11,392 KB
testcase_18 AC 83 ms
59,840 KB
testcase_19 AC 3 ms
6,940 KB
testcase_20 AC 3 ms
6,940 KB
testcase_21 AC 37 ms
26,240 KB
testcase_22 AC 76 ms
49,280 KB
testcase_23 AC 43 ms
30,848 KB
testcase_24 AC 46 ms
33,536 KB
testcase_25 AC 77 ms
52,736 KB
testcase_26 AC 17 ms
13,312 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 <algorithm>
#include <cmath>
#include <complex>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <vector>
#include <functional>
#include <cstring>
#include <regex>
#include <random>
#include <cassert>
#include <stack>
using namespace std;

#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repr(i, s, n) for (int i = (s); i < (int)(n); i++)
#define revrep(i, n) for (int i = (n) - 1; i >= 0; i--)
#define revrepr(i, s, n) for (int i = (n) - 1; i >= s; i--)
#define debug(x) cerr << #x << ": " << x << "\n"
#define popcnt(x) __builtin_popcount(x)

using ll = long long;
using P = pair<int, int>;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

template<class T>
istream& operator >>(istream &is, vector<T> &v) {
    for (int i = 0; i < (int)v.size(); i++) cin >> v.at(i);
    return is;
}

template<class T, class U>
ostream& operator <<(ostream &os, pair<T, U> p) {
    cout << '(' << p.first << ", " << p.second << ')';
    return os;
}

template<class T>
void print(const vector<T> &v, const string &delimiter) { rep(i, v.size()) cout << (0 < i ? delimiter : "") << v.at(i); cout << endl; }

template<class T>
void print(const vector<vector<T>> &vv, const string &delimiter) { for (const auto &v: vv) print(v, delimiter); }


struct ModInt {
    static ll mod;
    ll val;
    ModInt(ll v = 0) : val(v % mod) {}
    ModInt operator-() const { return ModInt(val ? mod - val : val); }
    ModInt &operator+=(ModInt a) {
        if ((val += a.val) >= mod) val -= mod;
        return *this;
    }
    ModInt &operator-=(ModInt a) {
        if ((val -= a.val) < 0) val += mod;
        return *this;
    }
    ModInt &operator*=(ModInt a) {
        val = (__uint128_t(val) * a.val) % mod;
        return *this;
    }
    ModInt &operator/=(ModInt a) {
        ll u = 1, v = a.val, s = 0, t = mod;
        while (v) {
            ll q = t / v;
            swap(s -= u * q, u);
            swap(t -= v * q, v);
        }
        a.val = (s < 0 ? s + mod : s);
        val /= t;
        return (*this) *= a;
    }
    ModInt inv() const { return ModInt(1) /= (*this); }
    bool operator<(ModInt x) const { return val < x.val; }
};
ll ModInt::mod = 1e9 + 7;

ostream &operator<<(ostream &os, ModInt a) {
    os << a.val;
    return os;
}
ModInt operator+(ModInt a, ModInt b) { return a += b; }
ModInt operator-(ModInt a, ModInt b) { return a -= b; }
ModInt operator*(ModInt a, ModInt b) { return a *= b; }
ModInt operator/(ModInt a, ModInt b) { return a /= b; }
ModInt pow(ModInt a, ll e) {
    ModInt x(1);
    for (; e > 0; e /= 2) {
        if (e % 2 == 1) x *= a;
        a *= a;
    }
    return x;
}

ModInt comb(int n, int k) {
    ModInt x = 1, y = 1;
    rep(i, k) {
        x *= n - i;
        y *= i + 1;
    }
    return x / y;
}

int main() {
    int n, d, k;
    cin >> n >> d >> k;
    vector<vector<ModInt>> dp(n + 1, vector<ModInt>(k + 1));
    dp[0][0] = 1;
    
    rep(i, n) {
        vector<ModInt> sum(k + 2);
        rep(j, k + 1) sum[j + 1] = sum[j] + dp[i][j];
        repr(j, 1, k + 1) dp[i + 1][j] = sum[j] - sum[max(0, j - d)];
    }
    
    cout << dp[n][k] << endl;
}
0