結果
問題 | No.1581 Multiple Sequence |
ユーザー |
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提出日時 | 2021-07-02 23:18:58 |
言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 1,895 ms / 2,000 ms |
コード長 | 4,053 bytes |
コンパイル時間 | 2,013 ms |
コンパイル使用メモリ | 185,324 KB |
実行使用メモリ | 160,588 KB |
最終ジャッジ日時 | 2024-06-29 13:06:33 |
合計ジャッジ時間 | 24,835 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 21 |
ソースコード
#include <bits/stdc++.h>using namespace std;typedef long long ll;typedef pair<ll, ll> P;#define DUMP(x) cout << #x << " = " << (x) << endl;#define FOR(i, m, n) for (ll i = m; i < n; i++)#define IFOR(i, m, n) for (ll i = n - 1; i >= m; i--)#define REP(i, n) FOR(i, 0, n)#define IREP(i, n) IFOR(i, 0, n)#define ALL(v) (v).begin(), (v).end()#define SZ(x) ll(x.size())// modinttemplate <int MOD>struct Fp {long long val;constexpr Fp(long long v = 0) noexcept : val(v % MOD) {if (val < 0) val += MOD;}constexpr int getmod() { return MOD; }constexpr Fp operator-() const noexcept { return val ? MOD - val : 0; }constexpr Fp operator+(const Fp& r) const noexcept { return Fp(*this) += r; }constexpr Fp operator-(const Fp& r) const noexcept { return Fp(*this) -= r; }constexpr Fp operator*(const Fp& r) const noexcept { return Fp(*this) *= r; }constexpr Fp operator/(const Fp& r) const noexcept { return Fp(*this) /= r; }constexpr Fp& operator+=(const Fp& r) noexcept {val += r.val;if (val >= MOD) val -= MOD;return *this;}constexpr Fp& operator-=(const Fp& r) noexcept {val -= r.val;if (val < 0) val += MOD;return *this;}constexpr Fp& operator*=(const Fp& r) noexcept {val = val * r.val % MOD;return *this;}constexpr Fp& operator/=(const Fp& r) noexcept {long long a = r.val, b = MOD, u = 1, v = 0;while (b) {long long t = a / b;a -= t * b;swap(a, b);u -= t * v;swap(u, v);}val = val * u % MOD;if (val < 0) val += MOD;return *this;}constexpr bool operator==(const Fp& r) const noexcept {return this->val == r.val;}constexpr bool operator!=(const Fp& r) const noexcept {return this->val != r.val;}friend constexpr ostream& operator<<(ostream& os, const Fp<MOD>& x) noexcept {return os << x.val;}friend constexpr Fp<MOD> modpow(const Fp<MOD>& a, long long n) noexcept {if (n == 0) return 1;auto t = modpow(a, n / 2);t = t * t;if (n & 1) t = t * a;return t;}};// binomial coefficienttemplate <class T>struct BiCoef {vector<T> fact_, inv_, finv_;constexpr BiCoef() {}constexpr BiCoef(int n) noexcept : fact_(n, 1), inv_(n, 1), finv_(n, 1) {init(n);}constexpr void init(int n) noexcept {fact_.assign(n, 1), inv_.assign(n, 1), finv_.assign(n, 1);int MOD = fact_[0].getmod();for (int i = 2; i < n; i++) {fact_[i] = fact_[i - 1] * i;inv_[i] = -inv_[MOD % i] * (MOD / i);finv_[i] = finv_[i - 1] * inv_[i];}}constexpr T com(int n, int k) const noexcept {if (n < k || n < 0 || k < 0) return 0;if (n <= (int)fact_.size() - 1) {return fact_[n] * finv_[k] * finv_[n - k];}// C(n,k), n <= 1e9, k <= 1e6T res = 1;for (int i = n; i >= n - k + 1; i--) {T a = i;res *= a;}res *= finv_[k];return res;}constexpr T fact(int n) const noexcept {if (n < 0) return 0;return fact_[n];}constexpr T inv(int n) const noexcept {if (n < 0) return 0;return inv_[n];}constexpr T finv(int n) const noexcept {if (n < 0) return 0;return finv_[n];}};const int MOD = 1000000007;// const int MOD = 998244353;using mint = Fp<MOD>;BiCoef<mint> bc;ll m;// dp(s,x) : sum = s, first term = xvector<map<int, mint>> dp;vector<map<int, bool>> seen;mint calc(int s, int x) {if (seen[s][x]) {return dp[s][x];}seen[s][x] = true;mint res = 0;int t = s - x;for (int i = 1; i * i <= t; i++) {if (t % i != 0) {continue;}if (i % x == 0) {res += calc(t, i);}if (i != t / i && (t / i) % x == 0) {res += calc(t, t / i);}}return dp[s][x] = res;}int main() {cin >> m;dp = vector<map<int, mint>>(m + 1);seen = vector<map<int, bool>>(m + 1);FOR(i, 1, m + 1) {dp[i][i] = 1;seen[i][i] = true;}mint ans = 0;FOR(i, 1, m + 1) { ans += calc(m, i); }cout << ans << endl;}